On my list that's before every flight session, merely because it's so easy to carry a lens cloth in the bag, only takes a few seconds, and is fairly pivotal to correct operation of the craft if you fly in those modes a lot. And while the cloth is...
So, indeed the issue was a dirty sensor. Added clean sensors every 5th flight or so to my checklist now. What is odd to me is that the app/controller normally shows a red barrier graphic on the display and it beeps when it gets close to...
May be irrelevant, and bit out of left field as a guess, but when did you last clean the sensors ?
Could there be small obstruction or something lightly coating 1 of the sensors on the right side that occludes it slightly, and could feasibly make...
It really varies from day to day and from software to software. Sometimes ICE is fine, sometimes not. Personally I found it amongst the least reliable of them.
A year later I would still posit that Hugin remains the only one that is error-free...