[Rasplex 1.8.0] TV input keeps switching back to Rasplex
I did a fresh install of Rasplex yesterday evening and since then, the TV (an LG) keeps switching back to the Rasplex HDMI channel from the Ziggo Horizon HDMI channel. It does so every 5-10 minutes, which is very annoying when we are watching TV. I've been running Rasplex on my Raspberry PI1 for 2 years (I never really switch it off and just keep it running) and never had this issue before. I've searched the forums but haven't found anyone with the same issue.
Is there a (new) setting causing this behavior or could it be a bug in the new version of Rasplex (I was running 1.6 before my fresh install)? Does anyone else have this issue or can someone poke me towards a cause or solution?