I am having S9+ which recently I upgraded software to Q from Oreo. Both Oreo and Q upgrade done thru online upgrade and not thru Samsung updates. Before upgrading to Q my phone started making random sound. Which after Q upgrade becomes quite frequent and loud. This is not a sound which is from selection of sound for notification or ring tone but totally different sound. I tried all the solutions mentioned on Google but this annoying sound is still persisting. Factory reset done twice, 1st before upgrading software by unlocking. And 2nd after upgrade while locking again. Now it has become very irritating. Please help me.