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Wow...I'm at a loss. Your temps are fine (65-70 is perfect, btw). Your medium is fine. Your pH is good, if less stable than it should be. In short, you're not making any of the normal mistakes that would cause problems.
Your PPM is spiking, though, which makes me think that *something* is getting into the reservoir and destabilizing your nutrient solution. You'll sometimes see the water turn cloudy like yours is doing if you add a lot of pH adjusters in, for example. But from the sound of it, you're not getting a chance to adjust the pH before the TDS goes wrong.
Is there any possible outside source of contamination? Is your secondary reservoir open to the air, by chance? Would it be possible to quit using the secondary res for a while, and maybe just use the drain tube and leave the main res sealed off?
Otherwise, I'm stumped. Maybe someone else has a suggestion?
P.S. DWC systems usually have a very good track record, in part because they're so very simple. A lot of growers have had good results from them. I'm guessing that there's something unique to your set up that's causing the problem.
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My journey as a gardener....
Round One - Blueberry x Haze Beginner's (un)luck and the learning process
Round Two - White Widow High temps = hermies  ...and how I fixed them
Round Three - Blueberry x Haze (again) Third time is just right (mostly)
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