Rock shock recons solo air.
worked perfect last week. took the bike for a quick spin yesterday. now i only seem to have about 25mm of travel and getting a banging sound as if they are bottoming out. also lockout doesnt work.

Any ideas

Rebound shaft seal head is leaking oil into the lowers. it's a known problem, and should be sorted under warranty.
If the fork is more than 2 years old, buy a seal kit and DIY or get a competent shop mechanic to do it for you. Should cost no more than £70.