Software synth output disappears and won't come back

On every song I work at some moment one of the software synths stops. The tackactivity meter moves, but the audio output dropped dead. The only way to get the sound back is to quit logic and start logic again. The behavior is random; it can happen to any softwaresynth at any moment. Any possible causes?
Thanks
Budy

This hideous bug bites me on average at least once per session.
The best part? Doing a bounce to find that killer pad swell in measure 73 is missing because of a dead instrument. (Hope you catch that before it's off to reproduction!)
This really needs to be fixed ASAFP, and is inexcusable for a Pro app.
(I read someone's post about a possible workaround, though it's never worked for me: the next time this happens, leave to song open and go to open another song. When it asks to "Close current song", cancel the entire action (taking you back to the original song). Allegedly the instrument should work once again, but it hasn't ever for me. A restart of Logic is the only thing that works. >:-[

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