Okay, Microsoft is looking into the problem of the adapter but it is possible that the fix might not come around for weeks and they are not responding to news requests about it so there are no details on what is going on about it.
You can probably look on the WiFi adapter in the Device Manager and see if there is a sleep option that can be shut off.
Now, since you are getting use of the WiFi with the April driver, there is mention of good performance with the June driver as well. If you don't need to, don't change from what you have.
In Windows Updates, if you see the WiFi adapter in the "Optional Update" section, right-click on it and tell it to "hide the update". Whenever there will be a fix, it will probably be a firmware update. Something like that will take time and would include fixes for other issues as well.
Don't do anything with your router. That tends to be a recommendation and a word of caution on that; if your other computers and devices have no problem, then it is not the router that is the problem. It will be the tablet. If you do have to update the firmware on your router, do that with a regular desktop with nothing running in the background. If that installation glitches, you can take the router and throw it in the trash.
Shutoff Sleep Mode! If it knocks out Bluetooth and WiFi (same adapter - Marvel), get rid of it. If you do like me, if I am done with the machine for a while, I just shut if off. If you need to leave the machine on, run the screensaver and use the "blank" option. That version uses almost no power.