That’s good to know because we’re starting to get some of those fails the last year or so. But once you turn it off and turn back on it will go away.
Definitely sounds like the r17.01ish firmware bug. I noticed this more with xtl1500s, pm1500s.
I know around 15 to 17 there was fail 01/82 head sync issues in the bricks to heads on the xtl2500, 5000s.
Many had to send them off to Motorola during Warranty on those some were able to recover syncing a new head and updating the firmware on those ones.
Since it sounds like you won't get newer apx anytime soon I'd have that dealer flash them with the latest firmware being agency radios.
If it was personal use I'd say there isn't much to need to bump their firmware.
As you know firmware contains improvement and bug fixes (thought mother M I'll add has been known to create new issues is the tech joke), there was feature fixes in the final version for trunking if I recall. It also updates the ucm, host and other areas if done legitimate. Worth it in a fleet of public safety.
I've seen conventional subs still at r12 out there.
When upgrades do come with a new platform it is handy to get the firmware and observe the notes with line you have.
I've seen some places still using type 2 mts radios such as Santa fe nm while some have xts portables and apx. Being type 2 analog they have maintained the older equipment and had those back then bumped to latest.
The xts xtl will do p25 and if you're not using or needing tdma phase 2 etc it'll buy time to have those later do p25 conv or phase 1 (if equipped in flash code). The user may cry they want a new radio but oh well. If it works, is tuned why replace it. Keep it going until it fully flops then issue out a replacement model.