mate sounds like he has a problem with his AYC diff ? it will either be the pumps failed, or the ayc ecu is fecked up, there are pressure switches etc which fail fairly commonly especially when servicing is poor, as I say clean oils vital for this set up.

pop into our forum mate, we have a guy in kent who's very good Rich, make a post and he will help you im certain

like you say economy is bad, although when set up properly they aint to bad, mine was even worse than a gsr mine was an RS, tanks tiny