Tvheadend

Setup:

Tvheadend v4.1-2332 on Raspberry Pi 3
Kodi frontend on another Pi 3
IPTV Automatic Network building muxes from m3u file (hts streams)

I have a number of channels for which I have multiple IPTV feeds. The reliability of the feeds is not great but there is no consistent best performer. Sometimes the feed drops out when recording; is there any way to automatically switch to another mux when one fails? I expect that there would be a short drop as the mux is switched but I'd like the recording to complete. At the moment if the mux fails, the bandwidth drops to 0 and the recording keeps going but no more data is recorded.

Grateful for any suggestions!