Korg Poly800/EX800 Users

Hi everyone

I finally perform the mods that I wanted to do from a long time, but unfortunately since 
then I have problem with memory.  I have a Mk1 poly with no back up battery.  I did the 
eprom mod to be able to load some patches with sysex.  It works great.  Also I did the 
moogslayer mod.  And recently i did the FM800 and the audio input mod as well the 12/
24 DB filter.  Everything work well.  I'm really happy about it, but it looks that I have a 
problem with the power supply since then.  I can't save patches anymore.  When I turn off 
the poly I loose everything, even when the poly is plug.  Is this ring a bell to somebody?
Also, I noticed something else .  Before the mod (FM800-audio in, 12/24), I was able to 
cut off the frequency near zero.  I really loved that because I was able to do some 
interesting wooshing FX, but now when I turn the knob way down, I can't turn the  
frequencies  to zero, I still heard a sound.  Is this related to a mod that I perform?  
I hope that is clear enough.  I'm sorry, my english is poor.  I hope someone will get it.

Thank for your answer.
Bernard