Actually I am wondering if this might have to do with either your Blynk app is outdated, or the firmware is outdated. A couple months ago Blynk had a service break and after it’s back online, it can’t communicate with older Blynk libraries any more. We immediately updated the firmware to use the latest library, but if you purchased OG before that you may still have older firmware (specifically, if you have the original firmware 1.0.0). The solution is to follow instructions here:
to update the firmware.