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Weak To None Cellular Signal

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hey guys

My car is built in 2017 oct with AP2.5 and mcu1

In the past month my cellular shows either one bar or just none

When driving in some area, full signal for couple minutes and then gone

It causes in car map not loading me sometimes navigation just showing routing without traffic data

Service center saying everything is fine as usual, definitely not true

Anyone has similar issue? How did you fix it?

I’m on 2019.20.2.1