FP3+ getting hot and reduces power during the last days

My FP3+ gets sometimes hot during the last days, though the room temperature is below 23°C. The hot area is in the lower part. LineageOS(+microG) gives me a short on screen warning that the power is reduced because the phone is too hot. I always have enegy saving activated so the battery lasts longer.

One time when the phone got hot I was in a building where the mobile data (4G) was available but quite weak. Sometimes even an audio stream broke because the connection was lost. I guess the modem was transmitting with full power.

Did persons with a sudden death experience similar problems?

Not as I remember, but have a look round:
https://forum.fairphone.com/search?q=fp3+sudden+death

Also have a look here, you may find some things that correspond to what you are seeing:

Let us know if we can merge your post there.

Fairphone 3 Teardown - iFixit helps.

I could reproduce it at another place where the 4G signal was weak.

It is mainly the RF Transceiver and the RF Frontmodul. The other area gets also hot, but the RF is hotter.

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