GU10 flashing when turned on, work if load added to circuit

[steveKN]

A strange one in my kitchen.

3 sets of 2-way switched GU10 `Philips down lighters. ( no dimmers)

Have been fine for several years.

Last week the fan/light remote receiver, ( connected via a on/off wall switch, using live which also goes to lights, neutral permanently connected to lighting circuit) on the adjacent conservatory, died tripping the miniature circuit breaker on the lighting circuit.

Removed and waiting for replacement.

Now the 3 LED sets ( 2x2 and 1x4) strobe flash when turned on.

If I turn on another light (non GU10) or fan to produce a load on the live-neutral spur circuit to the kitchen or conservatory, the LED GUI0 work fine, (but no with a load on any other part of the shared downstairs lighting circuit.)

They will still stay on if I turn the extra load off, unless I turn another of the light LED circuits on, then they all flash again, until I add another load when they all come on and all remain on. ( even again with load turned off)

I've checked the 3 switch live connections at either end of the two-way switching, and they're fine.

Any other suggestions ? They all have a common neutral and are fed from the same live from the switches.?

Thanks Steve