I have once again faced the frequency switching error while approaching KSEA. The approach handed me to tower on the final but even after i tried to switch multiple times to tower , i was unable to do so , I was still hearing the approach controller. The atc warned me 3 times to switch to Tower but after trying all the methods for frequency change multiple times it seemed that it was fruitless. I have also faced this issue earlier in the beta Frequency Switch Error
I hope this issue is resolved.
Hope it can be solved in no time. Good luck 
Oh boy, that Is a super scary error, I’m glad they didn’t report you. Did you abort the approach?