Thanks Alruf.
I switched off 265+ mode (now on pure 265) which allowed me to increase frequency of I-frame. The artefacts still appear but they are cleared much quicker. Luckily recorded footage seems to be ok (previously the recorded video was also corrupted with artefact / freezes / skipping so only time will tell how long it lasts).
But lets not pollute this thread with another problem as it may be difficult for other people to find right info for specific problem. Anyway, many thanks for suggestions!!
I switched off 265+ mode (now on pure 265) which allowed me to increase frequency of I-frame. The artefacts still appear but they are cleared much quicker. Luckily recorded footage seems to be ok (previously the recorded video was also corrupted with artefact / freezes / skipping so only time will tell how long it lasts).
But lets not pollute this thread with another problem as it may be difficult for other people to find right info for specific problem. Anyway, many thanks for suggestions!!