Hey everyone, @David,
Very glad to be here. I've been following the OpenWRT, then LEDE and now David's builds for a while. Yesterday, I decided to take the plunge. Note: I'm a long-time DD-WRT user who wants to switch permanently to LEDE. I have a WRT1900ACv1. And somehow no OpenWRT or LEDE build is giving me (stable) WiFi
The WiFi would either come on for a few seconds and then turn off on its own. Or it would stay on, and no devices would be able to connect. So, I'm stuck with DD-WRT (or McDebian, which runs flawless as well). The funniest is that the router's never rebooted on me even once! (using the 4.9.x kernels)
Here's where/how things get murky across builds:
1. DD-WRT 07-08-2017-r32597 (Kernel 4.9.38)
-No reboots (last I had 8+ days uptime before I attempted @David's LEDE last night)
-Currently on 07-19-2017-r32753 and a solid 7+ hours uptime since I rebooted it last night post re-flash of DD-WRT when LEDE didn't work out.
2. LEDE/OpenWRT/David's LEDE (Used Kernels: 4.9.x as well as 4.4.x)
-Tried all three builds, and both kernel versions, but WiFi (both N as well as AC) is a non-starter right out the gate. I am lost as to why this is happening.
3. Notable mention: McDebian (Kernel:4.9.31)
-Flawless, just like DD-WRT (and no reboots here either)
-Unfortunately it isn't as frequently updated like the other two, so it's my backup 
Router load:
1. WiFi AC
- 1 smartphone
- 1 laptop
2. WiFi N
- 2 smartphones
- 2 tablets
- 1 laptop
- 1 Amazon Fire Stick
3. Ethernet
- 1 desktop
- 1 NAS
- 1 XBOX ONE
Total devices handled: 11
Average devices powered and utilizing the network simultaneously: 6 (roughly 4 on WiFi, 2 over Ethernet)
Average temps observed: 69C - 74C (Oddly, while the fan does its spin cycle on power up, I have never seen it turn on any of the above builds for my temperature range. Hope that's normal - on any of the builds, I don't change the fan thresholds).
Last note: When erasing the NAND partitions (mtdX) for McDebian, mtd4 and mtd6 gave me a "bad block" warning, but proceeded to erase successfully and the router has be rock stable as noted above, barring allergy to LEDE/OpenWRT.
Any insights would be wonderful. I really love LEDE/OpenWRT from a technical standpoint, but my router won't let me switch 
Thanks much in advance!