data not working? call&text do

alright, this has been an ongoing problem for about a week now. let me tell you exactly what i did when it first started happening, and where i am at now.

-installed cm13, worked like a charm for about a month. ever since last Wednesday, data has stopped working out of the blue- showing an LTE logo but had an exclamation mark.

-called my service provider, updated my apn settings, but it still did the same thing or didn't show a data symbol at all

-factory reset, flashed stock rom to phone, wiped cache

-called service provider again, updated apn again. this time, on the stock asus rom, the 4G logo appears but no data is received. this is probably just a difference between CM13 and the stock OS, but it's pretty much the same problem with a different logo to it.

the apn settings are all what they should be for my phone, yet i'm still stumped by this issue. the reason i factory reset and returned to the stock OS is because i heard of someone else fixing this issue by installing stock again, but it was a different phone... i had to take the shot to see if it would work because at this point i'm ready to try anything.

any help would be greatly appreciated.

EDIT: forgot to mention i flashed WW_2.20.40.165, and i just saw a new update came out on the 16th, which i will try flashing later today. any other suggestions in the mean time would be great however!