I'm sorry buddy but that sounds like the EE RAM (the 32MB RAMBUS memory) has problems.
You can check by going to the memory card manager at the OSD and trying to navigate on a FULL memory card. If the PS2 crashes or show deformed icons, you have bad EE RAM.
Also bad sound may be caused by it because the sound data is stored there.
SCPH-10000_GH-001 SCPH-15000_GH-003 SCPH-18000_GH-008 SCPH-30001_GH-005 SCPH-30000_GH-016(V4) SCPH-30001_GH-010(V4)
2xSCPH-10190, 2xSCPH-10350, 2xSCPH-10280
"**** j0 hackers!"
-Sjeep (As seen on TOXIC OS ELF...)