I’m running UDP packet forwarder on my two (remotely deployed) mikrotik gateways without any issues. For those having issues it might help to switch to the UDP packet forwarder (you will need to change the ‘require authenticated connection’ setting in TTN gateway settings.)
BTW: It seems the pessimists were right. The firmware fix did not work. Issue is still wide open. 
I’m running a development version firmware in which the issue is supposedly fixed. The GW is up for more than a week and I’ve not had a crash yet.
The support person to which I’m talking told they they have finally identified a real issue and fixed it.
I see they have pushed a 7.20beta4 that might include theses fixes, I’ve asked support and I’m waiting for the confirmation. If that’s the case, you might want to try this version even if it’s not ‘production ready’.
I have tried the 7.20beta4 on a knot lr8 but lns/cups wont work so the fix may not be in beta yet!
Great to hear you’re seeing improvements; however, I do not. My wAP LR8 is still “stopping” every few hours even with the most recent firmware versions (including test builds).
Apparently there are a number of problems at play here, and at least the one hitting me is still not yet fully understood.
I’m just glad that there does seem to be work occuring on the issue. The old story: Things do happen, but quality depends on how they are handled and hopefully resolved in the end.
I’ve just received information from support that the fix is backported to 7.19.2 which is currently in internal test phase. So we can hope we’ll “officially” get it very soon…
Support told me that the fix is not in this version but in 7.21dev branch (which is a version I received from them)