Thank you for the fast answer David
I forgot to mention that I tried to increase and decrease bit rates, but it didnīt seemed to influence the results at all.
All my 3 SD cards are SanDisk.
I kept doing some tests after my first message and for some reason I no longer have any problem with the UHS 3 card. No frames skipping at all. I donīt have any idea what the problem was but it seems to be solved.