Virus B [broke - fixed - then broke again - now fixed again]

[oddbods finger]

My Virus B (Desktop) appears to be Intializing itself when I switch
on.
It doesn't happen every time though.

"OS4.8 etc..." comes up on the screen then "Access virus b" as normal
but then - "Initialize Global Memory?" comes up...
....which then switches immediately to -
"Load Bank A with Factory Sounds?"
This message flashes alternatively with -
"YES: -->[SINGLE]
NO: ANY OTHER KEY"
If I press any key other than SINGLE, this message then flashes up -
"No....keeping old sounds"

But then "Load Bank B with Factory Sounds?" comes up with the same
messages as above following after.

then the same thing again with Multi Bank.

After this, "Initializing Edit Buffers" comes up before finally going
to the normal screen.
Except now all the programs of A, B and Multi banks have random
garbled names and all the sounds have been wiped.
I can't even seem to program any sound into them.
Although I can copy programs from banks C to H into the A & B banks.
Banks C to H are unaffected.

Anyone got any idea what's happening?
I haven't had this Virus that long.
maybe I accidently set something wrong.

I've tried a Reset...(hold down the LFO1 [Shape] button and switch
on) which I believe is the right procedure.