disco TD5 starting issues

HELP!!!
I've just had my starter reconditioned after getting a clicking noise on turning the key!
it worked fine for about 2 weeks then started playing up again!!! all be it intermittently!
i took it back to the auto electricians who looked and could find no faults and of course it started perfect every time!!!!!
he changed a few connectors and it worked fine till today (1 day later!!)
when it has started playing up again
has anyone had any similar problems? and can anyone throw some light onto this area for me!!! its driving me round the bend!!!

Playing up how? it clicks or it does nothing? ... if it does nothing it might be the ignition switch or the exciter wire... if it clicks, it means the electricians took your money for nothing .... they must have replaced the solenoid contacts and core with new ones not just cleaned them.