IPhone 6+ Dims and Brightens Randomly During Calls

When I'm on a call on speaker, with the phone just lying on a table, the screen will go from bright to dim on its own after a period of time (no surprise there -- my old 5 would do that too).  But then after a few seconds, the screen will brighten back to normal again.
The interval between dim to bright seems random.  It appears to have no connection with the ambient light in the room, the proximity sensor, or motion.
Anyone else notice this?

Yeah man, i've got the exact same problem and had it a few times! i've fixed it once but now can't remember what i did lol.. have you replaced the volume/headphone flex? because that makes sense... otherwise it could be the sim card? please let me know if you have any luck

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