After the new update for Slow ring our phones Lumina 640 are restarting all the time and now they are useless! Also some applications stopped working! Anyone else has the same issues?
Try a soft reset. If that doesn't help then backup your data and perform a hard reset.I've also just come across this issue! I can't even access my phone's settings as it either reboots itself or forcequits the application when I try to open. Have you found a fix? My phone updated today on the slow ring on my 830.