My samsung galaxy core prime keeps freezing after I use it for more than a few minutes and I've tried many things to fix it such as checking for system updates, clearing the cache... But then I noticed that if I push down the back of the phone (just above the battery and below the camera and torch) my phone works normally. Does this mean that I have to take my phone apart to see if there is anything loose or damaged in my phone?
If you have any manufacuring warranty left on it then find your most local Samsung Service Centre and submit it for a diagnostic. If you try anything that breaks the sealsthen the warranty will be voided.
If the warranty has run out then your free to either still use a service location and ask them to advise on a costing or employ a standalone cellphobe shop to look at it.