For info
Ahead of seeking support I did a bit of an experiment. One of the strobes cuts out when fired on full with the diffuser on, the other one is consistently fine. With diffuser off the bad one works for a good while in air with full dump.
Submerging in cold water there is no issue at all with diffuser on. Thus there must be a heat sensitivity and the water must be keeping the strobe cool enough for it not be an issue. As I dive cold water I'm going to see how I get on as it may pose no dive situation issues for me.
For info I have successfully fixed the battery covers where the terminals bend and weaken with parts from RS. If anyone needs that info happy to share.
Now to make some new fibre cables (I'll not start that thread!) I'm comfortable with that.
Very little to take pics of last night in Loch Long Scotland.
Cheers and safe diving
Grant