All sorts of connection issues?

Have the Note 4 since its release last year. I own a cellphone shop so im very familiar with galaxy phone hardware and software. however, within the last month, my gps is almost not functional, always searching. Constantly disconnecting from accounts such as Facebook and twitter requiring constant sign ins and lack of notifications. and lastly about 10% of my texts wont send. only do once i restart the hone. Very annoying. I don't know if its an app, or software bug or what but any help would be appreciated. I have also tried, cleaning the phone, a new battery and several apps that claim to help to no avail.