Honda CB600 FS Hornet speedo working, not working, working

[Wonko The Sane]

2001 600 FS Hornet,
The speedo is not cable driven, it's electric and mine keeps cutting out for anywhere from a few mins to a number of miles.

Haven't quite worked out if it's coming back in after I've come to a stop / slowed down,

I figure it can't be a fuse as that would stop it working completely.

Everything else on the dash works, ODO remains on (it's LCD) but doesn't increase when speedo is not working.

Loose wire / dodgy sensor?

Where do I start with fault finding and sorting?

Thanks
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[Meatybeaty]

Start Here
Sorry matey sent you the CBR600 , but theory the same, I have the CB600 if needed
If its pre-sensor you will have to check the Tachometer