If you have the wired connection connected and being use at the same time as the wireless connection being used, then the computer will use the wired connection because it has the lowest cost. Meaning the wired NIC is faster than the wireless. Is this the issue?
Is 192.168.2.50 the IP address of the wireless adaptor? What is the address of the wired adaptor, it should be by default 192.168.0.1 when you enable ICS, therefore the MAC that's connected to the wired adaptor it's adaptor should be 192.168.0.2 or in the range of that subnet.