Quay,
I feel your pain! You referenced cords wearing out. Are your devices tethered somehow? I have had the charger port on fail on 2 phone. I could only charge them on a pad.
As for Apple, I had an iPhone 7 which worked perfectly. Updated to an iPhone 14Pro to get the good camera. Immediately found it was horrible for DCS, so that's off the map here. I don't use at all.
I have a very old iPad that I paid $80 bucks for, Worked perfectly but also got "goofy" on me, as you describe.. My new iPad ( a few months old) seems to be more problematic than the old one. But I don't think MTH is blameless either. I have had a terrible time getting brand new engines loaded, while at the same time seeing others just go "inactive" even when nearby on the same powered track. No rhyme or reason to it. I have moved engines to different sections, flipped them around end-for-end, removed every other engine that was on the tracks,,,,,no change. Then, for reasons I have yet to learn, they all start working again.
For this discussion, I'm assuming you use a the dedicated MTH wifi and not your house. My layout is all torn down now due to a house renovation, but that has been my experience right uo at August 1st. If you're anything like me, it will "just start working right" and you still won't know the how's and whys. Sorry I don't have a better answer!
Sunspots anyone???
Bob