Xbox Bridged connection problems.

Ok. So At one point I had my xbox connected to my laptop wifi through ethernet cord and it worked perfect nearly no lag. I did this by clicking "allow other network users to connect through this computers internet connection." Worked fine for a month or so. Then one day it randomly stopped working. So then i did the bridge connection option by de-clicking the sharing option. I do this and the lag is so bad i cant even scroll on my xbox. My question is how do i get it back to how it was before with the share option checked? I literally didnt mess with anything when it stopped working. Thank you for help this is super frustrating!!