CommentStreams:2e27d3a34792afd58a9ec488c30579f6

I posted as anon user #15 earlier. I think I got the problem resolved by routing the cable a little differently. I noticed I did not have the problem if the device was outside of the case (Geekworm P579-V2-K). I tried adding some electrical tape to the inside of the case (per Q4), but that didn't make a difference.

However, I noticed that, when the pi was installed in the case, the FCC cable was being pressed against the inside of case, which caused it to bend some and appeared to cause some upward pressure on the connection to the X1001 hat. So, I removed it from the case again and poked the cable in toward the heat sink of the active cooler. This caused the FCC cable to assume an S shape, which appears to have relieved the upward pressure on the connection to the hat. It's been back up for about 46 mins now with no further problems. Even with gen3 enabled, it seems okay now.

I'll add another update if fails again, but I think this might be the trick.