IPhone 4S Wifi drops randomly when in use

Today I got a message that I would be billed $15 because I passed my data limit. I'm on AT&T and I got no prior notice. No 65% notice, no 90% notice. Just one saying that I passed the 200mb mark. I guess that means I passed it in one sitting, likely because my phone switched from wifi to 4g when wifi was still in range. I know it automatically does this while asleep, but for me this is happening while using the phone, without warning and reason. Not only is $15 bucks a lot to pay, but really, I've been having this problem a lot and now that it's actually costing me money, there needs to be a hotfix. Either Youtube, the app that I've noticed this the most in has to fix it, or Apple does.
Note: I'm not going to turn off Cellular Data. Not only is it inconvenient to have to turn it off every time I transition from 4g to Wifi, but in the case that I lose my phone, I won't be able to use Find My iPhone. (When asleep, it will disconnect from Wifi, and without 4g Find my i doesn't work.)

this solution did not work for me. (I already had Ask for Connection disabled) -- any other ideas?
this has become particularly relevant as of late with ATT now trying to push Unlimited data plan users into switching plans with "speed caps" after 3gb of usage in a billing cycle.
It rolls out next month and there is apparently no other option other than switching plans; so after 3gb is used, the speed for those of us on the old Unlimited plans will be "reduced" for the rest of the billing cycle. The language is very sketchy and unclear, especially how they are even allowed to suddenly do this when we have contracts. When I called I was only given tips on how to keep my data usage under 3gb for as much of the month as possible. I was told I was contracted to unlimited "use", not unlimited "speed".
thus, why I'm trying to stay on WiFi as much as possible, when at work or home.
tl;dr but wanted to both ask for more info and provide some for anyone else out there who was grandfathered in with an Unlimited data plan from days of yore.

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