IPhone 5s: Intermittent wifi; wifi signal is full but phone not connected to internet

Hi all, I have a strange wifi connectivity problem.
At home:
iPhone 5s connects normally to wifi, but after several minutes of usage (particularly browsing the internet), wifi signal remains full but safari states that phone is not connected to internet. Other apps like whatsapp also don't work. When I disable wifi then enable it again on my phone, I can connect to the internet temporarily again, but after a few seconds it disappears again. If I leave it for a while, it automatically connects again, but intermittently and unpredictably. All in all, unreliably.
At home, MacBook Air works fine with no connectivity issues.
At other wifi locations, the same iphone 5s has no problems at all with wifi connectivity.
Also, I have already
- reset phone
- reset network settings on phone
- reset router
- unplugged and replugged modem and router to wall switch
- previous iPhone 4 on iOS 7 had no issues with home wifi
Thus, I am uncertain if this is a phone or wifi issue. My best guess would be that it is a compatibility issue between the iPhone 5s and my home wifi?
Any suggestions as to where I could start solving this problem would be very appreciated! Thank you:)

If you are having WiFi problems it is necessary to isolate whether the problem is with your network or your iPhone. Note: Do NOT consider your network to be blameless if some other devices can connect to it.
First, test your iPhone on some other WiFi networks: a friends, Starbucks, Barnes & Noble, etc.
If it works well there then the problem is probably with your network. Try restarting your WiFi router by removing power for 30 seconds. If that does not help check for a firmware update for your router. If none exists which corrects the problem consider replacing the router.
If your iPhone does not function well on other networks it possibly has a hardware problem. You could try Settings > General > Reset > Reset Network Settings to see if that corrects the problem. If not, contact Apple Support or visit an Apple store for evaluation. They can provide a replacement if your iPhone is bad.
If you need more help please give the make, model, and version of your WiFi router and how you have it configured.
See also here: http://www.apple.com/support/iphone/wifi/

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