Reed Hodges

I have a 2018 3500hd w/t. It has the bigger screen for radio and backup camera. I have chevy my link. It has 5,000 miles on it. About 2 weeks ago the radio doesn't get any louder after the 40 on the volume adjustment. It had a very loud radio before this, but now it continually gets louder until 40 and then stays the same volume the rest of the way to 63 and even seems to get quieter when cut all the way up. I have checked teen driver mode and it is turned off. I have also turned off auto-volume. Any help is appreciated, I can barely hear anything via bluetooth or usb and is lower than I would like on radio settings. I have searched and searched the internet and this must not be a problem for many.