I have been noticing this a lot lately. I need to babysit my node and manually disconnect and reconnect peers that LND thinks are offline but are really actually still online to resolve pending HTLCs before they expire and the channel is force closed. This is really annoying when it happens while I'm sleeping and I wake up to a force closed channel.

It's not my connection either. I have a solid internet connection with clearnet IPv4, IPv6 and Tor. Most of my peers are also clearnet.

I really hope this issue is resolved soon.