Problems with Z50 Steel Legend

I have two problems with this motherboard:

1. Lan Problems: my configuration is this motherboard and a board with Intel i225 chipset connected to a Qnap 2,5 Gb/s swith and to the fritzbox 7590 internet router. Sometimes i loose internet connection on both systems and the only way to solve this problem is a reset of the switch. With only two systems with Intel lan i do not have any problems with the switch. So i think the Realtek lan chip is the problem. Today i have update to the 10.48 driver and disabled Interrupt Moderation and Large Send Offload (found in this and other forums). I hope this helps.

2. System crashes if i enable the ASPM or Package C State options in the bios:
With both off the systems seems to be stable and uses 33W.
When enabling Package C State it goes down to 27W and with both it goes to 26W.
But then the system is very unstable. Mostly it crashes if i watch some movies and pause them. Windows is logging a WHEA hardware problem. Is this a known problem?

WHEA Error
Keywords 0x8000000000000002
ActivityID {96a01b54-9b67-4a0d-a96c-7aee2cefae92}
Length 3408 Bytes
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