Hi Christopher,
Have you tried doing the procedure for rebooting the headphones?
'''Turn the headphone off and wait for about 30 seconds.'''
'''Plug the headphone into a USB power supply via USB cord and wait 5 seconds. (Power supply needs to be plugged into the wall with power on).'''
'''Unplug USB cord from headphone and wait 1 minute.'''
'''Turn on the headphone and test if the headphone works properly.'''
Hope it changes something!