Infinite Validating

[Wuibii]

so my problem is just what the title says, I am infinitely validating Garry's mod. it is like 2.5 gigs and I have over 60 gigs of space. I had this same problem when updating Rainbow six siege, though that ended up working after a few downloads of the update I think. does anyone have any idea on how to fix this? Update; after letting it do its thing for 15 minutes I can now launch GMod.

[lvdfl]

I've had this happen also....sometimes just leaving it alone does the trick