My suggestion is not execute Serial.println and Blynk.notify inside an interrupt function (timer). do only necessary, turn-on some flag and do these things in loop().
Another suggestion: put a delay(500) on loop. You are saturating TCP connection.
BAD suggestion⌠any process blocking code in the void loop() is particularly bad with Blynk style programming. This is mentioned repeatedly in the Help Center documents and forum posts.
@yaujiet Stick with using timers and timed functions, they are non-blocking.
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