Yep, ive been having the same problems for a while and it stops when it wants to. Its pretty fucked up annoying and theres nothing i could do about it, wait some days and its over, i heard some others had the same problems. Just be patient
These days I have about 180 pings during evenings, and sometimes this goes up to 230, and always with a huge flux, sometimes up to a 50 ping fluctuation!
Then if I leave DB and try another game like ET, ping is just back to good ol' 30, 40 or 50 O_o
Default key is '
if you don't have a key for it then you'll prolly have to bind it again in your user.ini, eg. 'K - Toggleconsole' or consoletoggle. (choose your own key )
Can't remember which one of them it is, but if that doesn't help then i recommend a reinstall