Oh thank you for the answer,
I just created the Screenshot to help LilSnoop40.
I don't know what's "wpad" in my Network and it just popped up yesterday. Yeah my DNS-Suffix is fritz.box, defined by my FRITZ!Box, but i didn't activate "never forward non-FQDNs" and "never forward reverse lookups for private IP ranges" because my FRITZ!Box is the second DNS-Server (There is the DHCP and i don't want to set up every device like here). And also i don't know, if the domain "wpad" could be resolved.
I really don't know what you mean with the solution wpad.dat etc. I had no timeout errors 
Today the entry disappeared. But thanks for your efforts