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Alarm going off

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Over the last few weeks, the alarm on my model 3 has started to go off randomly, generally (and somewhat inconveniently) in the night resulting in scrambling to switch it off and not wake up the neighbourhood.

Sentry mode is not switched on as it's parked in my drive in a quiet area and generally, the car was asleep and then woke up abruptly with the alarm going off. It's currently running 2020.20.12 and this has not happened in the previous 6 months of owning it.

Has anyone else experienced this? I wondered if there was any way to get logs to see what triggered the alarm? I've read elsewhere that sometimes a flakey usb drive can cause the alarm to go off, but I wondered if this might be linked to any of the software upgrades.

Any suggestions/ideas appreciated as you start to get nervous leaving the car anywhere, including on my drive, if the alarm is going to go off unexpectedly!