Tvheadend

Hello
We use tvheadend 4.0-git04998595df on our Synology DS1512+ (OS: DSM 6.1.4). In the messages log there are a lot of errors, recurring all 12 hours like these here below.
What can cause this issue, how to stop them?

Thanks,
Dan

2018-09-21T02:11:22+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 1)
2018-09-21T02:11:33+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 151)
2018-09-21T02:11:44+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 303)
2018-09-21T02:11:55+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 456)
2018-09-21T02:12:06+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 609)
2018-09-21T02:12:17+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 761)
2018-09-21T02:12:28+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 915)
2018-09-21T02:12:39+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 1068)
2018-09-21T02:12:50+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 1220)
2018-09-21T02:13:01+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 1373)
2018-09-21T02:13:10+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 1)
2018-09-21T02:13:21+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 41)
2018-09-21T02:13:32+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 85)
2018-09-21T02:13:43+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 129)
2018-09-21T02:13:54+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 170)
2018-09-21T02:15:38+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 455, errors 1)
2018-09-21T02:15:49+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 455, errors 90)
2018-09-21T02:16:00+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 455, errors 182)
2018-09-21T02:16:11+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 455, errors 274)
2018-09-21T02:16:22+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 455, errors 365)
2018-09-21T02:22:33+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 1)
2018-09-21T02:22:44+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 113)
2018-09-21T02:22:55+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 227)
2018-09-21T02:23:06+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 342)
2018-09-21T02:23:17+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 456)
2018-09-21T02:23:23+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 1)
2018-09-21T02:23:34+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 90)
2018-09-21T02:23:45+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 182)
2018-09-21T02:23:56+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 274)
2018-09-21T02:24:07+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 365)
2018-09-21T02:24:18+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 457)
2018-09-21T02:24:29+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 548)
2018-09-21T02:24:40+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 640)
2018-09-21T02:24:51+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 732)
2018-09-21T02:27:31+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 1)
2018-09-21T02:27:42+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 91)
2018-09-21T02:27:53+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 182)
2018-09-21T02:28:04+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 274)
2018-09-21T02:28:15+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 365)
2018-09-21T02:29:11+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 269, errors 1)
2018-09-21T02:29:22+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 79, errors 26)
2018-09-21T02:29:33+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 359, errors 54)
2018-09-21T02:29:44+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 648, errors 86)
2018-09-21T02:29:55+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 78, errors 123)
2018-09-21T02:32:40+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 1)
2018-09-21T02:32:51+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 90)
2018-09-21T02:33:02+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 182)
2018-09-21T02:33:13+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 273)
2018-09-21T02:33:24+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 366)
2018-09-21T02:33:30+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 1)
2018-09-21T02:33:41+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 91)
2018-09-21T02:33:52+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 182)
2018-09-21T02:34:03+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 273)
2018-09-21T02:34:14+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 365)
2018-09-21T02:38:31+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 1)
2018-09-21T02:38:42+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 113)
2018-09-21T02:38:53+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 227)
2018-09-21T02:39:04+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 342)
2018-09-21T02:39:15+02:00 Synology1 tvheadend¹⁷⁶¹⁰: bat: invalid checksum (len 451, errors 456)