I have the LFM-1 Plus and had the same problem with the "auto" sensing. I played with 990's settings and the sub's dial for a while, then finally flipped the sub's switch to "on" and left it there. The sub has been "on" for 8 to 9 months now without a problem.

Oy
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Sony KDS-R60XBR2
Outlaw 990
5 Outlaw 2200's
L/C/R speakers: Outlaw LCR
L/R Surround speakers: Axiom QS8
Outlaw LFM-1 Plus
Sony PS3
Toshiba HD-A3 HD-DVD
Comcast 8300HD DVR
URC MX-850