Big slowdown (hang-up actually) after resuming from hibernation (T61 & Win7)

Hi
Recently I have noticed, that my machine is someteimes slowed down after resuming from hibernation on Windows 7 and I can't do anything. I wait one minute, two... but nothing happens. Even mouse cursor isn't moving smooth. Pressing ctrl+alt+del causes that "preparing security options..." screen appears but nothing more... So I can't run task manager. Only thing I can do is powering down & booting again laptop so actually I can say that my machine hangs up after resuming from hibernation.
I don't know if this is important, but always when it happend I was resuming system without AC connected and noticed that fan is not working.
edit:
today it happend again. I conncected AC but it didn't help. I have noticed, that when system is in this 'near hang-up' state - plugging usb mouse doesn't even cause mouse sensor to light.
Any ideas what's going on?
T61 7664-R6G core 2 duo 2.1ghz, 2gb ram, windows 7 32 bit (latest updates and drivers installed).

Are you by any chance removing a LAN cable while in hibernation?
I have a similar problem with my T61 7663-13G, Windows 7 x64 and Standby.
(Could eliminate my Minidocks and power supplies IMHO.)
But it seems like if I remove the network cable while in standby Win 7 will hang after the still successful login.
(hang = I can let the cursor jump inch by inch, but nothing else is responding.)
- Update:
Changed the driver from my wired network card from 9.13.16.0 to 9.13.41.0 and can't reproduce my hang-ups atm.
ThinkPad T61 (7663-13G) T7500 2.2GHz/4GiB/120GB SSD/Sierra MC8775 HSPA/Win7 Pro x64/(3rd Fan, 3rd NVS 140M), 2x 39T4587

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