Sounds like we've had similar experiences, except I've already opened a support case. Have tried a few firmwares, but no luck. I'm about ready to send this thing back.
Support called me yesterday & asked if they could set up an hour today to work the issue. I said "ok, how about 2:30pm CST" - support paused and asked if I could do it very early in the morning or later in the evening.
I said "no thank you, actually I'm good, the Almond+ is powered down and back in it's box - don't need to spend more time on it".
He said "hold on...the said, ok we will call you at 2pm cst tomorrow"
I said "ok" and then I went to Best Buy and bought an Airport Extreme. I put it in the same spot the Almond previously sat, powered it up, configured it, connected to it in the matter of a few minutes. WiFi Explorer reported a remarkable increase in signal strength on both 2.4 and 5.8 bands, with both broadcasting a single SSID. Upstairs, and in the driveway, the network is very usable where before there was no wifi available.
So, if I factor in the amount of time I spend setting it up vs. troubleshooting the Almond, the Airport was essentially free.
I am well aware that I'm missing some pretty cool features - but if they don't work anyway am I really missing them? I mean, I'd rather have a car with cloth seats, manual windows, no sunroof, and an am radio - that always starts and does 0-60 in 4 seconds vs a fully equipped luxury sedan with leather seats, sunroof, power windows, heated cup holders, and a 18 speaker surround sound system - that starts and stops randomly and has a top speed of 30 mph. Seriously - when you have to get to work, you need something that does the job of getting you to work first - if it can't get you to work, all the secondary bells & whistles don't matter. And by the looks of it here on this forum, even the bells & whistles are problematic.
So, maybe as a Kickstarter Backer I got an early production unit, maybe the QA process wasn't fully implemented, maybe the first units had a bad radio or dsp... who knows, but when I test a unit running factory defaults & updated to the latest firmware using a by the book wifi configuration and the signal strength, performance, and reliability are so poor the unit is unusable, I figure there's a decent chance that I'm not the problem and spending hours with me trouble shooting isn't a good use of my time.
Then, when I replace the unit with another brand/model and within minutes I have a long range, multi-channel, secure, high-performance wireless network running. Then I start to think about the lost time and money and figure I won't be taking that call at 2pm after all.