Map change error

Hello,
I have this weird problem
Everytime there is a map change my ET suddenly stops responding.
Then I get the widows error : "ET.exe reageert niet"
which means in english : "ET does not respond" :p

It sometimes just occurs when I'm playing and I have a little framedropn ET crashes , same error

I'm not going to post my entire CFG but you can ask for cg_ settings f.e. if this matters to the case.

ty in advance, eCho