Please help. Samsung galaxy s5 not connecting to 3g.

[Hunter_Rickles]

I have a Samsung galaxy s5 with a 2 yr. Sprint contract and I am afraid I've messed my phone up. This might be confusing but about a week ago I rooted my phone to run custom roms. I rooted it perfectly fine but I messed up on installing the rom. I factory reset my phone and everything was great. Well I then used Samsung Kies to upgrade to Lollipop 5.0 and that is where everything went wrong. Ever since I installed Lollipop I keep getting the message "You have lost data connectivity because you left your home network with data roaming turned off" and I can't connect to 3g. A tsome points my 3g will start working again for about an hour or so and then just turn off. It rarely does that. I have factory rest my phone twice but to no avail, I still get the data message. Please help, I don not know what to do. Since I rooted my phone it tripped the knox counter so I can't just send my phone in.
TL;DR I installed lollipop onto my Sprint Galaxy S5 and now I cannot connect to 3g

 

[kanewolf]

If you installed a generic or non-SPRINT version of Lollipop then that may be why it isn't connecting to wireless correctly.

 

[Hunter_Rickles]

If you installed a generic or non-SPRINT version of Lollipop then that may be why it isn't connecting to wireless correctly.

Is there any way I can go back to 4.4.4?

 

[kanewolf]

SPRINT has lollipop as an OTA upgrade... Maybe you will have to pay SPRINT to fix it ..