Repeatedly Vibrating on Charge - Asus Zenfone 5 topic

I've experienced this twice already.

My Asus Zenfone 5 repeatedly vibrates over and over again on charge. I usually fix this by removing the charger and putting it back again repeatedly until my phone charges normally again.

What would happen when the vibration starts?
-The charge signal will go on and off together with the vibration.

is this a defective phone?

SMS not vibrating when Phone on Vibrate mode topic

I'm having problems with my Moto 360 when it doesn't vibrate when the phone is set on Vibrate mode. If the phone is on ringer/silent, the Moto 360 will vibrate. Not sure if it's a setting I'm missing but I prefer to have my phone on vibrate and as insurance if I missed an SMS, the Moto 360 will vibrate on the wrist. BTW I'm using a Galaxy Note 4 (T-mobile)