Temperamental spindle

[mark84]

Hi,
a few years ago JazzCNC built me a router, however this last year I've had a reoccurring issue- the spindle either stops after a few mins, or more typically just doesn't start, the VFD has no reaction to mach3, even hammering the spindle button on mach3 has rarely worked.
Normally it's just a minor niggle - I leave it for switched off an hour and it magically works again (any less than an hour and it doesn't!?) but today it did 4 mins work and then decided no more, and the VFD hasn't reacted to mach3 since.
I've tried2 PC's, and changed the Ethernet cable, but neither has made a difference.
I'm not too technically minded, but maybe someone can help (Dean??)- I have taken a pic of the VFD, I've no idea why!
All I can tell you is the taped off wire is because the water pump was playing up a while ago and so I disconnected it- it's not made much difference as I haven't run any long toolpaths since, and it's sadly not corrected the issue!
Cheers for any thoughts, it's been a stressful day!
Mark