Second External Drive Keeps Dropping Off

I have two external G-Drives daisy chained together via firewire 800 and each have their own power plug.  They show up on finder as Drive A and Drive B.
They normally spin down when not accessed and spin up as needed.  It appears that when I wake up the Mac from sleep mode, Drive B
is dropped off and Drive A is still on finder.
The only way to get drive B to show up again is to power it off then back on.  Is there anyway to correct this?

Primary reason for electromagnetic devices to fail is the power surge at
start up and the resultant warming up to a satisfactory operating
temperature. Akin to light bulbs failing on startup, but not when
constantly burning.
Hmm, I've heard that one before, but I'm skeptical. And not sure the light bulg analogy is really suitable. Even shut down, if still connected to power, there's trickle current going to  the hardware, if I'm not mistaken. Anyway, there are posts from people who've shut down at night for ten years straight who've had no problems and then from users like you who swear by the opposite. A lot of this is just too anecdotal. I still need to see convincing statistics; and I don't think there are any.
And even if you're right about the startup power surge and temperature jolt to the drive, you'd still have to weigh in the possible negative of too much heat, too much of a good thing by never allowing it to sleep. Must also depend on ambient room temp. It was just 103 here (90+ inside) and I don't think I would have been helping the hardware last by not allowing the computer to sleep under those conditions.
Apple's recommendation to only shut down if the computer won't be used for a length of time and sleep otherwise is based more on the convenience  factor. There's nothing in there about what's better for hardware.
Anyway, different strokes etc. Not something that will ever be settled definitively one way or the other. Probably a lot depends on the luck of the draw.
Btw, Seagate's are getting a reputation lately for being pretty crappy.

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