X68000 Expert bus error at power on

[motorola73]

Hello. Yesterday a strange thing happened to me. After turning the sharp x68k off and back on regularly, the following message appeared: "bus error, please reset". Fortunately, after turning it back on after 4 hours, the regular screen reappears asking to insert the operating system floppy.
The wording of the error was not white, but yellow. Before turning it off, I tried the games and the operating system and everything was fine, except the dos utility "SWITCH.x", which got stuck with the classic message "... <A> <R> <I>", but pressing <A> returned to the dos regularly.
Is this a component that is failing again?
The battery seems charged because the date and time remain stored.
I learned that the Sharp X68k is subject to viruses like traditional desktop computers with Dos and Windows.
Just in case, I list the games that I have restored with teraterm and played so far (all non-original copies taken from the "TOSEC" package via uTorrent):
-Street Fighter II champion edition
-Gradius (version with Window SX at startup)
-Final Fight
-Pac-Man
-Super Mario Bros.

Thanks in advance.

[leonk]

Yes. These computers are very fragile.  Date and time are saved in the RTC, not SRAM.  Sounds like SRAM might have gotten corrupt and needed to be reloaded.