Whenever I keep the phone on wifi and the screen is off, I don't receive a notification if I get an email, snapchat, whatsapp message, groupme message, or anything. So pretty much, it seems that after I put the phone down, it isn't syncing any of the applications. This happens only on Wifi. I've messed with my router but there was nothing i could do to fix it. I have a linksys router.
This is a big problem for me because I don't want to use up all the data on my phone by turning off the wifi.
The "Keep wifi on during sleep" is on always and has been like that forever. Does anyone else have this issue or know what to do? Thanks in advance.