Snapchat background Battery drain

[DWMUFC]

I've had snapchat in deep sleep since June, I don't get notifications and I'm fine with that as only check now and again.

However last few days Ivebstarted receiving notifications and Snapchat is draining huge amount of battery in the background despite it still being in deep sleep supposedly.

Have cleared cahce if device, rebooted and redownloaded Snapchat but made no difference.

Any suggestions?

Thanks