GE Dryer possible control board problem

I have purchased a condo recently; Dryer seemed Ok; after 1-2 weeks start beeping at the middle of night; open and close door; 2 hours latter beeping again; up-plunged it. Recently cloths was not dry; noticed Dryer goes to "Cooling off" at the start; lights goes on and off and start beeping; played with volumes and managed to make it work and cloths was dry. It seems control board have some issued; need to know if it worth fixing or getting another dryer; this Dryer perhaps was as old as Condo which is 6 years; my unit was rented for long time. My guess is unit is reached to it end; but not sure how much cost to replace the control board; and if I do; something else might go wrong after a while. What is your advice?