Quadcopter, motors stop during flight

Hi everybody,
I have a problem with my quadcopter : Sometimes (± 1 out of 5 flights), motors suddenly stop for 0.5sec and then continue spinning. It’s not a problem when it happens when the copter is flying high but when it is flying at 1 meter, it can lead to a crash. I already broke some arms due to this problem.

I included the log file, can any guru analyze it ? On record ±45222, you can see that the throttle output drops to 0, but I never asked for that.
Thank you!

Seems I cannot add a new attachment nor edit my post. Here’s a pic focusing on the problem.

Your log does not include RCIN, but I can tell you that CTUN.ThrIn is dropping as well.

Has to be a radio glitch.