Pluto taken to frequent disconnects?

[radiogareth]

Strange problem here, my Portsdown/Langstone system (I have two, one fully boxed, one as development mule etc). Both have recently become REALLY sensitive to what I expect are ground potential differences.
Ground MODs have been done on both Plutos so its 'not that'.
Even connecting an antenna (isolated from system ground) seems to cause issues.
Run the latest upgrade in case something got corrupted. No change. Choosing Langstone often freezes at the "Langstone loading" blue window.
Whilst previously the whole setup was run from a single PSU (pre-amps, small amps, LNB PSU etc) I now have to battery supply my Portsdown., but even that is a lot more flaky than I have become accustomed to over the last year.

Suggestions (very) welcome.

Gareth