Yes this is a well known problem and I had the exact same issue. I had ZERO useful help from Phonak Support and almost handed my hearing aids back. Luckily I was able to come up with a solution.
See here: Phonak Marvel: TV connector disconnects after x seconds of quiet TV signal - #27 by sundance
EDIT: my P90R do not connect to my MacBook either. The only way I could get them to connect in a stable fashion for Zoom calls is via the gadget mentioned in the link above. My aids connect OK with my iPhone but will not connect via BT to either my MacBook or iMac.