I have my truck just randomly not start after starting with no problem.

What is your question?

Truck usually starts with no problem then every once in awhile it just does not start. Battery tests fine by evry so often just clicks lights on dash come on but truck does not start... then out of no where do not know why or what but truck will start and run fine for days even weeks/ months but then out of nowhere again will not start and just had to have it towed. Banged on starter n had it tested n tests good and replaced relay n solenoid but still does can someone please help mainly cuz mom likes to drive cuz its BIG n make she feel safer but afraid cuz of issue... ..so thanks ahead of time for any help/answer/s!!?