Data connection keeps cutting out when screen is off - Galaxy S II Q&A, Help & Troubleshooting

The data connection on my gs2 is constantly cutting out when the screen is off. I'm getting the best connection I coud get but after about 10-20 minutes of using it as a wifi hotspot nothing on my iPad will load, I check my phone and the H symbol has gone but appears not long after I take it out of standby, how do get it to keep data on? It never does this on a 3G signal just on the high speed onnection.
I'm using sensation rom 4.1 with siyah 4.1.5

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It does take a few seconds but not 30-45 usually about 2-3 to cut off data and 2-3 more to reconnect.. thats been my experience...

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Please help! I am now the victim of the AT&T "unlimited" data plan BS where they slow me down if I use too much data, so I have to use WiFi.
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Hello
I had this V30+ H930G for awhile and it's been about 10 days that my WiFi keeps dropping when I connect it and if I try to reconnect it quickly after it drops (by clicking Connect) nothing happens so I have to either wait a few seconds or disable and enable wifi to get a retry at connecting which I still have a high chance of getting DCed again from WiFi.
Here is what I tried so far:
4 Different WiFi routers one of them were another cellphone.
Network Reset
turn on and off battery saving
Updating/repair phone through LG Bridge.
Reset/Erase everything.
sometimes my WiFi stays on for hours but sometimes it just drops every 5 seconds. with full 5 bars
even if the WiFi is open and not password protected it drops.
so does it sound like hardware problem? I didn't try to downgrade to previous versions. I don't wanna repair this phone if possible, but I'm still wondering if this is a hardware problem or just software?

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