Today for no known reason my S9 wouldn't spool up after 45 min it wouldn't load and start hashing. It has been working fine for a month. It was new never used sealed in box. I reflashed firmware with keep settings to 2017 firmware. Same after 45 min. I did sd card t9+ recovery, flashed 2017 firmware unchecked keep settings and it spools up In the usual 5 minutes but to the stock antpool addresses.
When I change the pool addresses it goes back to hanging for 45+min. When I reflash and uncheck keep settings it fires right up. Change pools and hangs.

Any ideas?