I have been having an Internet-related problem on my iPhone 5S for a while now.
It started out with seemingly random Internet disconnection even when there is a perfectly good cellular (4G) or WiFi signal shown on my device. For instance, no emails or messages (like Whatsapp or iMessage) are being pushed to my device, or when I try to search something on the mobile browser, it shows that there is no Internet.
One thing I noticed is that when I do a search on a mobile browser, it seems to load for a long time (more than 10 seconds), only to return a 'No Internet' message.
The only resolve to this matter is to restart my device. I would get connected to Internet with no problems whatsoever (until I encounter the problem again).
I tried doing a reset of network settings, and also a reset of the entire settings. I even went on to do a restore as new (without restoring from a backup). This did not eradicate the problem.
I have already had several appointments at the Apple Genius Bar because of this problem. They didn't seem to know the cause of the problem, nor to resolve it; I got the device exchanged in the end. However the new device I obtained started having this problem as well.
Maybe this is another bug that iOS 8 has? I never had this problem before updating to iOS 8.
Thank you for reading and I hope that somebody has an answer to my problem.