IPhone 4s sluggish wifi, better downloads on 4G: iOS 7.1.2

My iPhone 4s is often sluggish to stream videos, download music, apps, etc while connected to my home wifi. For instance, I'll be browsing reddit and want to watch a video clip, I'll click play and it will spin and spin and spin and not play. If I turn off wifi then it will start playing almost immediately. Same with email; it won't retrieve new emails and I'll have to pull down to get it to retrieve email I know is there, over and over, and sometimes I'll get mail box errors too- then when I shut off wifi it will work much better/ retrieve emails faster, etc.
What is going on with my phone that it's faster off wifi? Anything I can do to fix it? I just recently dropped my ATT unlimited data plan, so now more than ever I'm trying to keep it on wifi when I'm home. Any advice would be greatly appreciated....

Try to reset the phone by holding the sleep and home button for about 10sec, until the Apple logo comes back again. You will not lose any data by resetting, but it can cure some glitches.
If this does not help, setting it up as new device would be the next step:
How to erase your iOS device and then set it up as a new device or restore it from backups
To make sure that this is not software related, set it back to factory settings, without using any backup data afterwards. Set up the rest of the personal settings manually and test the Wi-Fi function.
If it still does not work, this is a hardware issue and the phone has to be serviced by Apple or an Authorized Apple Service Provider:
Use iTunes to restore your iOS device to factory settings - Apple Support
Find an Apple Authorized Service Provider
iPhone - Contact Support - Apple Support

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