Delayed turns to one side...

My microsizer has been having issues with making right hand turns...when the car is upside down, it goes left and right no prob, and when its running on a hard flat surface with a fresh doublecharge (I have to charge it twice to get it full, no clue why) it turns both ways just fine, but after about a minute, I can only turn left, when I turn right I have to let go of the forward button and then it will turn the wheels, and I can go again, and this is really pissing me off. My car is modded so I can't return it or send it in to be replaced, so what am I to do? By the way I'm in college, and $30 is like my entire funding for 6 weeks.