[Q] Wifi not working any more

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I'm hoping someone can help me. I installed CM KANG 7.1.5 on my Milestone a couple of months ago and for the most part, everything was working great (at least better than the stock 2.2 on it). But over the last week or so, I've been having a problem with wifi on my phone. Basically, wifi is not working any more or at least it's inconsistent now.

Previous to this week, I had no issues. I had a number of wifi networks set up, and everytime I went to the wifi hotspot, the phone would automatically switch from using data to wifi.

However now, it appears the phone doesn't detect wifi networks any more. I've tried multiple hotspots and still nothing. I've tried using Wifi Analyzer and doesn't see anything either. I've rebooted the phone multiple times, taken the battery out, reseated the SIM card and still nothing. I use 3G Watchdog and Juice Defender and have removed both and still nothing. The strange thing is it's sporadic. ie. wifi will work one day and then the next day in exactly the same spot, the phone get no wifi at all.

Has anyone else experienced this issue? How did you fix it? I've thought about wiping the phone and starting over again but I'm hoping to avoid that, if possible.

Thanks for your help in advance.

Doing a complete nandroid backup, wiping everything, and installing a new ROM takes me a total of about 15 minutes. If the problem I was having isn't fixed by that, I just restore the backup.

I should also point out that 7.1.5 is outdated and the current version is 7.2.0; quite a bit of work was done on WiFi issues in the past few months, and you're probably missing out on fixes for these exact issues.

It can be a pain to set up a new ROM, but worst case scenario is that it doesn't fix anything and you can just restore the backup and be right back to where you were an hour ago.

Please keep us updated here.

Sorry, I'm somewhat new to this (this Milestone is the first phone I've ever rooted, installed CyanogenMod, etc) so I'm probably going to ask some very noob questions here. My apologies if these are very simple or dumb questions.

I've been hesistant to rebuild/upgrade my phone to fix this problem for a couple of reasons including -

My wifi still comes and goes randomly. I worry that maybe it's a flaky hardware issue more than software so I don't want to spend all this time rebuilding it again to find out it's a loose connection or something like that instead.

I assume all my apps, data, settings, etc will be wiped out if I rebuild or update my CyanogenMod unless I use something like Titanium Backup to back them up? Or is there some better/faster way for doing it or maybe CyanogenMod and Nandroid have some better/faster solution that I don't know about? It took me, it seemed like days, to fully restore all that stuff last time so I want to make sure it's worth doing.

Is there an ETA on a "production" aka non-RC version of 7.20? If it's coming soon, I'd rather wait. I'd hate to upgrade to the RC version and then 2 weeks later have to do it all over again.

Thanks for your help.

About ugrading to 7.2:
- do full nandroid backup first
- clean both caches
- apply 7.2 zip
- clean both caches again
- rebot
I use that method when moving from one version of the ROM to another and no serious issues (one or twice I have to clean caches one more time after first restart). In worst case you have nandroid backup so you can quickly move back.

I have done full wipe (including partial sd and complete ext partitions cleanup) just few times e.g. moving from CM6 to CM7.

Generally I apply full wipe only when moving from one ROM to another, in beetwen versions of the same ROM I just clean caches twice.