logging me out repeatedly

hey guys ??

i’ve been having a little trouble. ever since upgrading, my admin panel seems to log me out repeatedly. it will not remember my info & when i click a link that normally redirects to my admin panel where i’m logged in, i’m forced every time to enter my information again. and it says above the input fields:

ERROR: The username field is empty
ERROR: The password field is empty

any suggestions on what might be happening? once i log in everything is fine & normal – i’m getting no other errors except that one & it’s been doing it since the second i upgraded.

thanks ya’ll !