My S7 is not running anymore after 2 Days of working fine.
I have changed PSU(Bitmain Brand) from a working S7 already and also made reset.
I Don't get any reply from bitmain.
Do you have more than one? In your logs, you can see it failing to communicate with the cape:
[ 7.816322] bone-capemgr bone_capemgr.8: bone: scan failed (10 time)
[ 8.324303] bone-capemgr bone_capemgr.8: Failed to scan baseboard eeprom
[ 8.331371] bone-capemgr: probe of bone_capemgr.8 failed with error -110
So my guess would be to first doublecheck the connection between the Beaglebone and the cape (the board it plugs into) - maybe try unplugging it and plugging it back into the cape (careful not to bend any pins). If you have a second S7, then try swapping Beaglebones first, see if they both work the same, and then if they do, try swapping capes.
Hope that helps!