Need help
 

hola peeps just bought a 2nd hand cube aim not sure on the year has a cube rear wheel and dt swiss front my prob is my rear wheel will not stay true. i took it to my Lbs they trued the wheel soon as i put it back on the bike and pedal buckles straight away took it back to the shop they changed the bearings and re trued the wheel again put it on first pedal stroke its like a banana again any ideas?

Punctuation.

Very helpful