Bongo Fury

and I stoped and turned the engine off and restarted and it was fine, do I have possible gearbox trouble or maybe I read some where that the fluid could be low, if so how do I check the level and top up....

PS Bongo under warantee....

Dipstick under the drivers seat, engine running, handbrake on, footbrake on, Range through the gears & check level while still running

Make sure that it is warm to get an accurate reading too

Could be a sticky solonoid and may not get worse for ages or never

it happened to me and not again for nearly a year then needed sorting as it got worse.