playback lag with 128 Gb card


I have a new android (6.0)  lenouvo yoga book tablet. I bought a 128 GB SANDISK ULTRA® microSD UHS-I CARD to store some movies on it.

interstringly when i playback the video it has lags , and stops and freeses  for about 3-5 seconds before continoung

things i’ve done and checked so far :

chaking with utils if the card is fake - no evidence found

changing video player software ( now running vlc)

playing the video file from the tablet inner memory is fine

reformatting the card

runnig a benchmark application - called sd1bench - results where: read 53MBs , write 30.2 MBs

replacing a card with same

today I  took my friend’s card wich was 32 GB SANDISK ULTRA® microSD UHS-I CARD , benchmark results where lower and for my surprise - NO VIDEO Playback LAG at all

any ideas ?