Text messages come in exactly 15 minutes late Sprint GS4

[Malabeh]

I use the text messaging app textra and as of lately (few days), I receive many of my text messages exactly 15 minutes after my friends send them. I'm using the Samsung Galaxy S4 on Sprint. I tried turning my phone off and then on AND updating the PRL and profile, but none of them works.

 

[ex_bubblehead]

Talk to Sprint, it's their network.