Reverse gone on a vxl esc ?

[speedy]

Hi !

My friend has a rustlervxl on witch the esc is not working properly :( First of the esc somtimes shuts down after like 5sec driving with a fully chaged maxamps 3s 8000mah pack why ? and secondly the reverse has disapered ? we have tried sevraltimes to reprogram and calibrate it but htat didn't help? Shoud he send it back to traxxas to get a new one ? We live in Sweden so that woud take some time to get it back:(