h2s with sandisk 128gh skipping video every 15 to 20 seconds?

[crow]

hi
just recorded something this afternoon with h2s woosh v5 ,on a 128gb sandisk cruiser blade usb stick
when i have tried to watch just now ,it it glitches pixelates for a miisecond and skips 9 to 12 seconds of recorded programme
ist skipping avery 20 seconds or so
is it more likely to be the usb stick speed ?
as when the line glitches it freezes for about 6 to 7 seconds
where this is different

thanks