It's all due to the new version. It wasn't designed to run online with loads of users and is throttled in a number of places - along with only having a 5 user limit.
Quick solution is to drop back to the old version which didn't have these restrictions, however that won't be of any use for people with later cars.
Long term is to wait for me to catch up with everything so I can sort out a proper method, however, the search function can't easily be replaced - so will continue to work (or not work) as it does now .....