Blynk- GSM disconnecting after working fine for sometime with Arduino UNO

I am using Arduino UNO and SIM900 module which connect through hardware serial (0,1), using TinyGSM library. My aim is to control three LEDs independently from mobile from anywhere, I have utilized blynk virtual pins for the purpose. I removed the serial monitor commands as hardware serial was used for communication with GSM module. The program was uploaded successfully and it was even working fine for few seconds but then started disconnecting and connecting . What could be the possible reasons?
Smartphone: android
blynk release v0.6.1
P.S.- please consider for now, code shall be added later