Tvheadend

When I tune some channels, I can playback only ~5 seconds of live video before it freezes. Attempted recordings of 30 minute programs on these channels only record ~5 seconds. Below is a log file showing the errors that I am receiving.

2020-06-18 21:11:37.036 http: ::ffff:127.0.0.1: using ticket 7E1B4A49AD470D33B5B0FA15D3BE40FAB201552F for /tvh/stream/channel/c04224aac4e888a603c5fd8b56091a86
2020-06-18 21:11:37.036 mpegts: 491.028MHz in OTA - tuning on LG Electronics LGDT3306A VSB/QAM Frontend #3 : ATSC-T #0
2020-06-18 21:11:37.037 subscription: 0002: "HTTP" subscribing on channel "KPHO-HD", weight: 150, adapter: "LG Electronics LGDT3306A VSB/QAM Frontend #3 : ATSC-T #0", network: "OTA", mux: "491.028MHz", service: "KPHO-HD", profile="NVENC", hostname="::ffff:127.0.0.1", client="libmpv"
2020-06-18 21:11:38.151 transcode: 0001: 1:MPEG2VIDEO 1920x1080 > HEVC 1920x1080 (hevc_nvenc)
2020-06-18 21:11:38.151 transcode: 0001: 2:AC3 > Passthrough
2020-06-18 21:11:38.151 transcode: 0001: 3:AC3 ==> Passthrough
2020-06-18 21:11:38.278 transcode: 0001: Using preset default
2020-06-18 21:11:57.886 TS: OTA/491.028MHz/KPHO-HD: AC3 #53 Continuity counter error (total 1)
2020-06-18 21:11:57.889 libav: mb incr damaged
2020-06-18 21:11:57.889 libav: slice mismatch
2020-06-18 21:11:57.889 libav: ac-tex damaged at 6 61
2020-06-18 21:11:57.889 libav: ac-tex damaged at 4 62
2020-06-18 21:11:57.889 libav: ac-tex damaged at 19 63
2020-06-18 21:11:57.889 libav: ac-tex damaged at 5 64
2020-06-18 21:11:57.889 libav: slice mismatch
2020-06-18 21:11:57.889 libav: ac-tex damaged at 41 66
2020-06-18 21:11:57.889 libav: ac-tex damaged at 30 67
2020-06-18 21:11:57.889 libav: Warning MVs not available
2020-06-18 21:11:57.889 libav: concealing 3120 DC, 3120 AC, 3120 MV errors in P frame
2020-06-18 21:11:57.907 TS: OTA/491.028MHz/KPHO-HD: AC3 #52 Continuity counter error (total 1)
2020-06-18 21:11:57.907 tsfix: transport stream MPEG2VIDEO, DTS discontinuity. DTS = 1824681, last = 1674531
2020-06-18 21:11:58.333 tsfix: transport stream AC3, DTS discontinuity. DTS = 1825483, last = 1649803
2020-06-18 21:11:58.372 tsfix: transport stream AC3, DTS discontinuity. DTS = 1820160, last = 1632960
2020-06-18 21:12:06.304 TS: OTA/491.028MHz/KPHO-HD: MPEG2VIDEO #49 Continuity counter error (total 1)
2020-06-18 21:12:06.354 tsfix: transport stream MPEG2VIDEO, DTS discontinuity. DTS = 2584440, last = 2097954
2020-06-18 21:12:06.493 tsfix: transport stream AC3, DTS discontinuity. DTS = 2559883, last = 1995403
2020-06-18 21:12:06.832 tsfix: transport stream AC3, DTS discontinuity. DTS = 2580480, last = 1955520
2020-06-18 21:12:11.556 TS: OTA/491.028MHz/KPHO-HD: AC3 #52 Continuity counter error (total 3)
2020-06-18 21:12:11.556 TS: OTA/491.028MHz/KPHO-HD: AC3 #53 Continuity counter error (total 3)
2020-06-18 21:12:11.616 tsfix: transport stream MPEG2VIDEO, DTS discontinuity. DTS = 3058914, last = 2737593
2020-06-18 21:12:18.852 TS: OTA/491.028MHz/KPHO-HD: MPEG2VIDEO #49 Continuity counter error (total 3)
2020-06-18 21:12:18.872 tsfix: transport stream MPEG2VIDEO, DTS discontinuity. DTS = 3707562, last = 3061917
2020-06-18 21:12:19.130 tsfix: transport stream AC3, DTS discontinuity. DTS = 3697483, last = 2643403
2020-06-18 21:12:19.224 subscription: 0002: "HTTP" unsubscribing from "KPHO-HD", hostname="::ffff:127.0.0.1", client="libmpv"

I am able to tune and watch the channel using dvb5-zap without any problems. The verbose output from that program is posted below

dvbv5-zap -c ~/dvb_channel.conf "KPHO-HD" -v -o test1
using demux 'dvb0.demux0'
reading channels from file '/home/jrb0184/dvb_channel.conf'
Device LG Electronics LGDT3306A VSB/QAM Frontend (/dev/dvb/adapter0/frontend0) capabilities:
CAN_8VSB
CAN_INVERSION_AUTO
CAN_QAM_64
CAN_QAM_256
CAN_QAM_AUTO
DVB API Version 5.11, Current v5 delivery system: ATSC
Supported delivery systems:
[ATSC]
DVBC/ANNEX_B
Frequency range for the current standard:
From: 54.0 MHz
To: 858 MHz
Step: 62.5 kHz
Failed to guess country from the current locale setting.

tuning to 491028615 Hz
video pid 49
dvb_set_pesfilter 49
dvb_dev_set_bufsize: buffer set to 6160384
audio pid 52
dvb_set_pesfilter 52
Got parameters for ATSC:
FREQUENCY = 491028615
MODULATION = VSB/8
DELIVERY_SYSTEM = ATSC
Lock (0x1f) Signal= -44.00dBm C/N= 31.76dB
Lock (0x1f) Signal= -44.00dBm C/N= 31.76dB
Record to file 'test1' started
received 24630068 bytes

Lock (0x1f) Signal= -44.00dBm C/N= 31.45dB

I am running ubuntu 20.04 and have installed tvheadend from the PPA.
version 4.2.9~pre+201911151752-0~built202006011817~git5bdcfd8~ubuntu20.04.1
The tuner card is a wintv-quadhd pcie

Any help would be greatly appreciated. Thank you.