Why is sound out of sync? Marshmallow 6.0.1/ZTE ZMax Pro

[ChatfJ01]

Video and sound are out of sync. YouTube as well as SD card movies, so it's not my WiFi or YouTube. Gonna check a couple possible fixes, but I thought I'd get the post up now and see if anyone bites. Thanks!

 

[dpham00]

Is this over speakers, headphone jack or Bluetooth?

 

[ChatfJ01]

Speakers and headphones for sure. Haven't checked Bluetooth yet. I restarted device, and at first it worked fine, but got bad again after about thirty seconds of video. The sound seems to be ahead of the video by about a tenth of a second.

 

[ChatfJ01]

Speakers, headphones, and Bluetooth. The sound is actually ahead of the video, which is weird because usually in this kind of defect it's the other way around, so maybe it's the phone/android having a video issue?