The audio has recently started having a horrible echo (not specific to any one device) & the dropped calls are SO irritating. I also used to be able to switch devices while in a call & Messenger will longer do that w/my PC. From mobile to mobile is ok but desktop Messenger now says another device is handling my call. Also, sometimes a call will drop entirely but show that you are still in the call, leaving your long distance gf on a dead line over night (since we sleep on Messenger).