[Sprint HTC EVO 4G LTE] timtlm:
Someone started a thread a while back on this, but I wanted to start my own hoping that this issue may get a little more attention, and keep a detailed thread for future use. I love this phone, but this is the one significant issue that I have.

I spend most of my day and evening on wifi since I have it available at work and home. I've noticed since day one that I wasn't getting my notifications on time specifically in Gtalk, and still exists to this day after the latest 2.13 OTA update. When I hear my phone get a notification, I will check it, and the notification has a timestamp in the notification drop down, so I know I got it just then, but then in gtalk the timestamp on my message is several minutes earlier. I have seen it as much as 45 minutes late. It is very noticeable whenever I turn on the screen that instantly I get a notification. The issue exists with all push notifications. Gmail notifications will arrive late as well as exchange notifications. I've seen reports about it happening with WhatsApp messenger. It has been theorized on other forums that the wifi radio goes too deep into sleep for the notification to wake the phone up.

My wifi policy is set to stay on always. I've tried factory resetting. I know that the wifi stays connected while it is sleeping and is not disconnecting. I've tried multiple wireless networks. I've tried 2.4ghz vs 5ghz. It has nothing to do with smart sync disabling data as this is happening during the day and not between the hours of 12am and 7am.

I have done a lot of searching on Google about this issue, and I've determined that it is an issue with the entire line of HTC One series phones. People have reported this issue on the One X (International and ATT), the One S, Incredible 4g, and of course many other reports on the Evo LTE.

I have compiled many of these reports in a thread I opened on HTCs support forum site here: http://community.htc.com/na/htc-forums/android/f/222/p/15183/62995.aspx#62995

Please feel free to test this yourself. Connect to wifi, turn your screen off, send yourself a gtalk message from a separate account. If it comes in on time, wait about a minute and try again. If it doesn't come in, wait as long as you can stand or just turn the screen on, and see your notification come in. I tested this on a friend's Evo LTE who insisted he wasn't having the issue, and I was able to duplicate this. It seems that most people must not use wifi as much as I do, and maybe just haven't noticed.

Current solutions / workarounds:

Turn on Best Wifi Performance in the advanced wifi settings - kills battery

The best solution that someone found on another forum was to use an app called REGPON Wifi KeepAlive. It is an app that puts a partial wakelock on the phone in order to keep it from going into deep sleep. Check both boxes included in the app. The first starts the process, and the second will turn it off when wifi is disconnected. This doesn't have a huge effect on battery as I thought it would since it is putting a wakelock on the phone. I actually get very good battery life still, and can last through the day with heavy usage. It's nowhere near the significant drain that you get with the Best Wifi Performance option.