Hidden service: Suddenly the service does not respond to new connections (INTRODUCE2 cell on intro circ with no corresponding rend_intro_point_t)

I am hosting a hidden service with tor on "Windows Server 2008 R2 Standard 64-bit".

The clients can connect to my service without problems after I start tor (my service is available as it should be).

After some time (it depends - it can be 10 min, 30 min, up to 2 hours, but no longer than 2 hours) i get the following warning every few seconds:

[warn] rend_service_introduce(): Bug: Internal error: Got an INTRODUCE2 cell on an intro circ (for service "") with no corresponding rend_intro_point_t.

(see attached tor logs)

If i get this warnings, the service is not reachable for new connections, so i have to restart tor (existing connections seem to be working).

Tor on the client side shows no error message (it seems that the service is reachable for the client, but the client does not get a response from the service, otherwise a message like "hidden service is unavailable (try again later)" would appear - which is NOT the case)

After the restart the service is available again, but after a maximum of 2 hours the same problem appears again (service is not available for new clients).

I have nothing special in my torrc file (only the default file with HiddenServiceDir and HiddenServicePort additionally defined).

Trac:
Username: reiam