peugeot jetforce efi 125 2003?

hi, i have a jetforce 125 efi, on a 03 plate..
basically when im riding all my lights jump on and off, but if they turn off then all i have to do is hit a pot hole or bounce the bike up and down and they sometimes come back on. (not all the time tho) the only lights that always work a my indicators/hazzards, brake light and flasher light.......... Any ideas that this could be please ?