Game keeps disconnecting from server

[lomosa12]

My game keeps disconnecting from the bo2 server whenever i change my resolution and texture and join a map in solo. Game seems to be fine running at 800x600 and low texture i tried with multiple resolutions with low texture but that doesnt seems to work i did the same for high texture and low resolution which which doesnt seem to work either
but the thing is i've changed my resolution and multiple times in different maps and they all seemed to work fine i dont know whats going on