Since it has been repeatable over multiple devices, then it is likely in your code… of which we will need to see here before we can go any further.
Be aware, that this is NOT a code shop, we do not exist to troubleshoot your code, rather to help you learn how Blynk works… but let’s start with looking at what you have and seeing what, if anything, we can do from there
Please format all posted code as per directed in the Welcome Topic, which you have read, correct?
