About a month ago the clutch slave cylinder went on my car had it towed to the garage the dropped out the gearbox replaced the cylinder & also fitted a new clutch in it, well since then when it get warm its really hard work to get it in gear or you can get it in at all but if you stop it seems to clear itself and it will be ok for a bit It never done this before it went to the garage. I phoned the garage the other day to complain about this and the bloke told me all they done to the gearbox was top the fluid up but he said pop it in a we will take it for a test drive. I dont really not a lot about cars so does this sound like the clutch is not working correctly or the gear box is on its way out?