No stream on client, newa or vlc - Unexpected error in RTSPKeepAlive

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I bit the bullet and bought a Telestar Digibit R1. It scanned the channels fine, and NextPVR downloaded the channel list, using the URL the Digibit provides. However, two problems emerged:
1. The channel listing was devoid of channel names, even though all the tuning info was there.
2. NextPVR was able to tune into the nameless channels - very briefly! I got no more than five seconds of video then black, while audio continued unchanged.

Any experience here on what to do now?

Thanks.

UPDATE 6/9/17
Trying this on another PC with a clean install, I get video - sometimes - but no audio (I think I can sort this out), but it also pops up with the 'No tuner available' error. Sometimes. I think the device is very buggy - even tough I've updated the firmware. I'm going to do some more digging around...

This probably justified a new thread...

We're probably going to need to see some logs. I've got a Telestar Digibit R1 that works pretty well here.