Has anyone else experienced the error where a call comes in while on wi-fi and/ or mediaplayer but when you try to press answer it hangs the device.
The phone just plays the ringtone for a few rings then vibrates continually not allowing you to do anything at all not even turn the device off using hardware buttons.

I had to remove the battery to reboot.

It has happened whenI am watching a video or in the web-browser and/or IM conversations.

Is this a known issue?

http://bugs.maemo.org/show_bug.cgi?id=8723

Its a known issue and a BIG one.