Exclamation point next to cellular signal cm12.1

Recently I have been having this issue. I have reflashed my ROM and even then this issue will eventually occur. When it happens. I can only fix it temporarily (via clearing dalvik/cache) and by going into mobile settings and clicking on the already selected access point name. After I do any of these, the next time I reboot, the exclamation point comes back. Please help me!

Things to note:
-I flashed the stock 24B modem so cm updates work
-Adaway is active
-Xposed 5.1 installed
-HTC one M9 camera flashed

(I'm putting these here just in case they may have something to do with it)

Sent from my LG-VS985 using XDA Free mobile app