S6 - Textings/Calling issue

[AC Question]

Im not too sure if this is a common issue, but after the 6.0.1 marshmellow update. my phone would receive texts extremely slow. Sometimes ill receive a bunch of texts in the same exact time from different people. Also sometimes when someone tries to call me, it sends them straight to the voice mail. So far i tried clearing cache and data, solutions? besides factory reset?