Recently, I have noticed that my phone's wifi status is continually showing data transferring. That is, the arrow in the upper left corner of the status icon is always being displayed.
I am sure that this was not always the case. In the past, even recently, the arrow was not displayed most of the time, showing up only when I was actively using the network or, in some infrequent cases, when the phone needed access to data for some background task.
The main reason I noticed this was that battery life on the phone has been drastically shorter than normal. I don't use the phone very much, and can typically go days, sometimes as long as a week without charging the phone. But since this has been happening, the phone will go from fully charged to only 80% just overnight while I'm sleeping.
If I disable wifi before bedtime and have charged to 100%, the phone is only down to 99% by the morning.
I have disabled all of the obvious potential suspects I could think of — uninstalled Skype, turned off auto-updates, turned off auto-backup, all sync options I could find — as well as some other stuff that I think shouldn't be related, just in case (like location services).
The only thing that has been different recently is that I used a hotel's public wifi last week; they use a service provided by a company called Roomlinx. But I haven't heard of any Windows Phone virus that can infect my phone just from being on the public network.
I looked in the Data Sense app, but it doesn't show any volume of activity that seems large enough to account for data being transferred over wifi 24/7. The top app is a Windows Store download of 91MB when I reinstalled Skype after having removed it to check to see if it was the cause (it didn't seem to be). The second largest app is the Weather app, with only 13MB of data usage.
- Are there any other tools or diagnostic techniques that I could use to track down what's keeping my wifi busy all the time?
- Are there any "known culprits" for this kind of behavior? I've done searches on the web and here on the Windows Phone Stack Exchange site, and couldn't find anything that seemed relevant.