"R" key on keyboard is sometimes working and sometimes not

[PrPrO]

Hy,
my r key on PC isn't working even on the on-screen keyboard or on the other keyboard, but when i restart my compute it is working well, but after some time i is not working anymore but i can write R with shift+r o the little r when caps lock is enabled and then have to press shift+r
Can You please help me?
Thank You in advance

 

[Mark56]

Borrow a USB keyboard and plug that in and see what happens with the "R" key.

 

[PrPrO]

i have 3 keyboards, i use 2 of them
it was the pšroblem on both of them, when i restarted it it seems that the problem is gone, but b4 when i restarted after i've done sth. the problem came back, ill post here back if the problem comes back

 

[gbhall]

Turn the keyboard upside down above a table and (failrly) gently tap one edge (not the keys), on the table-top for a few seconds. Be amazed at what falls out, and if the R keys is reliably working again I will not be the least bit surprised.

 

[PrPrO]

well, not alot of thing ell out cuz i cleaned it few days ago

 

[Endless]

I just got this keyboard and I'm having the same problem it clean when I use a different keyboaRd it does the same thing I honestly don't know what to do