Can anyone advise me please?

• SatNav (V1.7 Map 2.1 2017/18) lost all previous destinations and settings to German clock time, then kept resetting to UK time
• Googled satnav issue found that Mercedes were sending out updates to remove Traffic at the start of September - coincidence?

• Then the centre media Unit started to reboot every 10/12 seconds - can access if quick for about 2 seconds, then locks up and reboots

• Contacted Service they said they had not sent an update and if they had it was unrelated
• Took the car into Mercedes for a £200 diagnostic, they say the Media Unit will not take an update and needs to be replaced
• Said no parts are available in the UK or Germany and could take 2 weeks to six months
• Cost to replace is £2,363.5 less a 68% discount total due when the get the part and install is £756.32

First I am so disappointed at the issue on a premium product so soon after the warranty ran out

Disgusted at the cost!

Is this an isolated incident?

Can I source another unit elsewhere from a used damaged car?

the android Auto upgrade kit a contender to fix my issue?

I would really appreciate some expert opinions please,

Thanks