New BlueOS or Ardusub causing delay at about 2 hours into dive

Ah yes, that’s the one - have corrected above.

If you refer to this?

If so, that is what I have been running, which shows as v4.7.0(stable).

I am unsure if the issues were from BlueOS update or Arduous update, but the issues were not present before when running 4.5.7 AND BlueOS 1.4.3, with the same hardware.

I am going roll back to 4.5.7 & 1.4.3 as was the last stable combination, then add one at a time. Alas this will take a few weeks now for me to test.