Text Alerts on iPhone 13 Pro Max not Playing/Vibrating
I have my Text Tone set to a homemade .m4r file with Vibration enabled (I have a handful of homemade .m4r files that I've been using for several years on every iPhone I owned.)
When I got an iPhone 13 Pro Max last fall, the text alert (both sound and vibration) were not happening. I checked that my .mp4's were synced to it and they were. In "Sounds & Haptics" > "Text Tones", I selected another tone and immediately re-selected my preferred text tone. This fixed the problem but not permanently.
Periodically, the alerts (both sound and vibration) stop and then unselect and reselect the tone to fix it. What is causing it to stop the text alerts? My iPad hasn't had this problem -- it alerts me on every new text message.
I currently have iOS 15.2.1 installed.
I have the automated DND set between 10pm and 7am.
iPhone 13 Pro Max