Myself I found out during the mounting of the servo's that the servo tray for rudder/elevator came loose. That triggered me to make sure all the more critical fixings were strenghtened by some epoxy (firewall, servo tray, mounting plate for the wing).

I just read a thread here in the Netherlands where somebody lost his Tojeiro 50 due to loosening of the mounting plate of the wing (the piece you screw the two bolts in, which hold the wing in place). He lost his wing in flight. Tojeiro did replace the model. So you might want to check that as well before your next flight.