I'm having the exact same problem you've described and shown in your posted video.
All my Firmware has been updated to the latest versions on both amp and footpedal.
Like "jjack972", I have been adjusting the Noise Gate settings in an attempt to resolve this problem, with at least some improvement of the original condition, but it seems there is still some noticeable - I would describe it as a decaying drum cymbal like sound after silencing the guitar strings, particularly with mid to high gain ( FX1) settings.
I'm going to keep trying different noise gate settings adjustments, and also am going to switch to a Furman EMI/RFI/Surge (SS-6B) strip from a standard generic surge protector to see if that helps the problem.
I'll let you know if any of that helps.