I have my nitro vee and sv27 at my grandparents andthey both screwed up so please help

1st: On my sv27 i turned on the tx then pluged in the batts and it did its beeps then pulled the trigger like always and it didnt beep and put the throttle reversing swich on then swiched back qnd it beeped so i run it and the steering is unresponsive turn right and it stays right then gliches the goes strait again the the boat keeps going while im not even holding the trigger then stopps and nothing works. I need help figuring this one out any quetions are ok!

2nd: my nitro vees servos have a mind of their own and i dont know what is causing the problem. I Ran it then it goes to full throttle and had to steer it by the dock and catch it and the servo was gliching and holding full throttle then i shut the motor off and the steering servo started turnng to the right so i turned the boat and reciever off and the servo still moved! Please help