I had this problem with 8.1, and again with Win10. The last couple of weeks it's been terrible, with WiFi coming and going all the time while, other devices are connecting just fine. Drivers are all updated. (For some reason I couldn't find the combination of my model and Win10 on the Acer website, but some research showed my driver version was new enough.) I also found and changed the setting to prevent it being shut down to save power, that didn't do much either.
Today, with a little help, I ran MSconfig and disabled pretty much everything that's not Microsoft, and that seems to have helped. It also made my Acer Aspire start up almost as fast as it used to do before Win10!
I suppose you could be a bit more sophisticated and figure out exactly what processes are interfering with each other, but so far this blunt method seems to have done the trick!