Just an update:
I had to have a full electrics test on the house today for legal reasons.
so obviously the modem , router , server etc needed to be powered down for a few hours rather than having several disconnects.
i was hoping after the modem being up for well over forty days that interleave wouldnt rise , however on reconnection im gutted to find its gone up again from 1009 to 1024
... seems my modem really doesnt like being powered down at all , the last time was when the modem firmware was updated , then it was 950 rising to 1009 and only powered down once.
it really doesnt seem to drop , only rise , and even then only 1 disconnect seems to do it
im just hoping i never get a powercut now