I faced this problem where I used a new flash trigger and after a couple of good photos, photos started appearing like this https://imgur.com/a/iNw4rkr then the camera stopped working for a while and when it did there were two lines following the f stops. so I tried the old trigger and had the same problem, after a while I realized that the shutter was 1/ 400 and 1/250, and when I slowed it to 1/100, no problem anymore.
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You need to make sure your flash unit can keep up with your camera shutter speed.
I’m not sure about the specifics, but I think HSS (High Speed Sync) will allow you to avoid those situations. But your flash needs to support it.
If not, just manually change your shutter speed to what the flash permits.