[Galaxy S III Q&A, Help & Troubleshooting] Jarmezrocks:
Can you please open the build.prop of each of these ROMs and tell me what the value is for

wifi.supplicant_scan_interval=

On my stock Samsung ROM (LTE international) this is set to 180

what ever your value is for yours, halve it and then tell me if that makes any difference?

So in this example change it to wifi.supplicant_scan_interval=90

You do this with a root browser app (free on this forum) http://xdaforums.com/attachment.php?attachmentid=915223&d=1329956263

or rootexplorer. Make sure that you have read write permissions to exit the file by long pressing it in rootbrowser/explorer.

Save the build.prop with the new value. Change the permissions back to read only. Reboot the phone.

Test the change and see how it fairs against the previous rating (you say is very bad). If the phone is perfect, keep trying by adjusting the value is say 10 or 20 incriments back towards its original value. i.e. 90 is good. Change it to 110. Test it again.

The reason you want to do things like this is because whilst your wifi is on it will be scanning every 90 seconds instead of 180 and although this will maintain a solid connection it will more than likely impede battery performance. i.e your phone battery won't last as long.

You keep increasing in increments till you find a happy medium between maintained connectability and lost of battery power to increased scan rate.

IF however dropping it to 90 does not satisfy you with the connection strength (what ever your test is of transferring a large file of your liking?) then reduce the numerical value to less. I recommend that if you have gone to less than half of the standard rate already and your are not happy, that you test by reducing it in much smaller increments e.g from 90 down to 85.

After all of this, if you are not happy with the amount of consumption your battery is chewing on a lower rate for an "ok" connection then maybe you may want to look into flashing a different modem that is more suitable.

To give you an idea of just the type of thing that goes on in this Android world, my Galaxy S2 had a LPQ modem on it as standard from Optus. This was a very poor choice on Optus behalf cause for in order to maintain any sort of connection the wifi.supplicant_scan_interval=10

YES!! Every 10sceonds it was scanning to maintain connection. I switched to LPR modem and reduced my wifi.supplicant_scan_interval=360

The result was a great solid connection and much better battery performance.

I believe that the modem is not just deviced dependent, but also region (geographically) as well as provider dependent.

I can bet money on it that the issue you have is most definitely a not suited modem. Most of the time the providers give you the best modem for your phone on their network....and othertimes they are completely wrong and totally **** things up.

I flashed a Telstra 4G modem onto my Optus 4G S3.....I did not get any signal what so ever besides 4G. Wifi was average (to nearly no change). And that was after I had flashed the stock XXAI9 modem (UK) which had great signal and wifi across most areas but did not ever pick up 4G LOL.

Hope this information has proved valuable to you.

Regards,

James

PS: I have no idea where you are located or what network so can't even give you a vague recommendation as to what modem you should migrate to?