I have the same problem. Super annoying. Every bluetooth control with my Sony MDR 1000x headset was working flawlessly before and suddenly it didnt work anymore. So, I realized a forced update was done and now I know it is the update 1803 which is flawed.
I also noticed that when connected to the computer via bluetooth (for only sound and volume up and down) eventually I would either have to restart the computer or repair the headset, to continue being connected to the computer with the headset. Happens if I ie. let the computer run, without sleep or reboot, for 1-2 days.
I suspect that also is related to the 1803 update.
They should publish a fix. This is totally unacceptable.
Have at least disabled forced updates as best I can, so now I will try to revert back to the update mentioned by someone here, so that I can continue using the bluetooth controls, which worked before.