Bad/low audio when someone calls FP4 with IODE

Been having Fairphones for many years, the best one was FP2, but eventually I could not use it anymore. Had a regular one for year until they closed 2-3G and I had to get a new phone again. So now I have a FP4 with IODE, works great, until someone called me, and I could hardly hear them. Put the sound level to max but that did not change anything. What is the solution???

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