Wireless Authentication Error Occurred

I recently am battling this wireless issue. Here's the timeline of what I did:

• Rooted Samsung S3 LTE (aka i9305) with old bootloader 4.1.2. Firmware was XXBMD5. Wifi was perfect.
• Flashed Agni kernel. (At this point, I wasnt paying attention if wifi was good as I was using mostly data.)
• Flashed AMCHA v9 KitKat ROM. Updated the firmware to XXUFOI1 but still with old bootloader. (At this point, I did notice that wifi was spotty and was dropping more frequently.)
• So now I notice that when I am near the router ie full wifi range, I get connected. No problem whatsoever, but if I move further like 3 meters, it drops, and I get "Authentication Error Occurred". Once dropped, if I try to reconnect, it would not get connected or prompt incorrect password.

I searched online and found its common among Samsung users. I have tried the steps as outlined in a thread.
1) Flashed stock rom with root.
2) Full wipe and factory reset.
3) disable power saving mode via *#0011#

Still no joy. So I have saved a log and hoping wireless experts can take a look and tell me what is going on. Basically, I started the log capture when I turned on the wifi when Im unable to connect to the router and then walk to the router and it got connected and then I walked away again. So I hope wireless experts can tell me with this logcat whats going on. :confused:

What I have not done:

1. Flash stock JB ROM via Odin. (Users have reported that it doesnt help so I did not try. as yet.)
2. Take apart the phone to check for loose screw in wifi module.

Thanks in advance.

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