Just wanted to share a bit of good news that happened to me today (and for anyone that has an old Antminer R4) this info could potentially help.
I had an unexpected good event happen on one of my miners today - my old Antminer R4 - you see a lot of them processing at half rate (4THs instead of 8THs) because one of the two hash boards 'goes bad'. Well that happened to me over 8 moths ago on my R4 and today after a power brown-out my other miners never missed a beat and stayed online working away while the R4 appeared to be working (with one board @ 4THs which it has been for the last 8 months and many hardware reboots) but on Kano.is was showing it wasn't processing any shares and hadn't been for over 19 hours. Usually I do a HARDWARE reset by shutting off the main power supply and turning it back on & that resolves the issue. However this time I instead forced a soft reboot in the Miner Configuration Web GUI, and to my surprise - WOW - the 2nd hashing board CAME BACK TO LIFE! Now the old R4 is back to processing at over 8THs! Just thought I'd share some good mining news. Have a good one & mine on with KANO!