I've had my 3590LM for a few months now. I notices intermittant freezing. I realized it always happened when I had the bluetooth on and connected to my phone. I spoke to Customer Service twice, and confirmed the phone is listed as compatible, and so we went through upgrades, deleting and reinstalling the bluetooth updates on it, and then the entire system. It still is not fixed. I now am sending it to Garmin for a new replacement..
Re above post, I'm not clear what is meant by "abnormal powerdown". You only held the button down because it already was malfunctionig (as have I).
FWIW I had this same type of problem when I first got my 2595. I had paired it with my phone (not on the compatible list BTW) and it downloaded my contacts and everything worked fine for several weeks. One day it started having problems pairing with my my phone and at the same time my phone would constantly power-down and re-set every time it tried to pair with the Nuvi. The Nuvi would also hang requiring a hard re-set (Not every time) Hmmmmm....
Shut off the Nuvi Bluetooth and everything would be OK. Turn it on and the problem would return. Finally figured out that the only thing I had changed was the contacts on my phone to include a few pictures to I.D. the incoming caller on the front screen. Removed these from the phone contacts and re-set everything and all returned to normal. For some reason pics in the contacts were causing BIG problems on the phone whenever it tried to pair with the Nuvi.
While I had no further issues with the phone acting up after figuring out the phone book problem, I -did- still get occasional freeze-ups on the Nuvi even with the Bluetooth off. Like you though, I haven't experienced any since installing fw v7.10.
Reboots on the 3490/3590 seem to be common when Bluetooth is enabled and paired to something. I think reboots are unacceptable in a navigation device (or any device really). I wish Garmin would figure this out. For now, I'd suggest disabling Bluetooth for a week and see if the problem goes away (just to isolate the problem).
If that doesn't work, consider downgrading to an earlier software version. I got a reboot on v7.50 recently at the same freeway exit that a much earlier software version also rebooted on, so I switched back to v7.20 which I didn't seem to get any reboots.
Garmin is having loads of bluetooth problems. I have a 2595. It pairs to the Ech HD and my phone for smartphone link data.
I reported 2 problems.
1) If your car goes off and the garmin says, shutting down, and you tell it not to, the next time the car comes on it will not pair to the eco hd unit
2) if you have 2 devices to pair, eco HD and phone, most likely, one of them will not pair. Probably due to not handling the 'I am here' returns from the devices if they come in at the same time. You usually have to go to settings, bluetooth, phone and re-save the phone connection. They should have 2 statuses on the main screen to show pairing statuses. If not paired, clicking the status would do a re-pair attempt.
I analyzed what could be doing it and wrote it up in the ticket.
Garmin's response? They gave me an email to send 'my ideas' to make this work to a developer. Geeeez...
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