Do you think they're using the guise of "its solar radiation" as cover to do a software update to fix a more problematic "bug", and perhaps tangentially there are some changes in said-update to improve some error correcting type code (eg: related to detecting spurious bit flips).
No, because aerospace is not garden-variety Silicon Valley webshittery.
There is a slightly different level of discipline and engineering ethics at play.
Yeah I don't buy it either.
If it was really 'solar radiation' there would be more small details.
Not in aviation.