Unlikely to be a hub radio issue, since the OP says all of the newer model zwave switches are working. It’s just these last older model ones that are not.
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Your depth of knowledge and patience in doing detailed responses never ceases to amaze!
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Thanks—as a network engineer I worked with both zwave and Zigbee before ever getting my first ST hub back in 2014. So it’s just experience in an obscure area (Network protocols) that most people care nothing about. LOL! 
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Completely missed that. I was focused on the 35 devices all offline at once part of the comment.
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Yeah, since these are all the same older GE switch model, and we know that that model had issues with status synchronization that were fixed in the stock groovy DTH, my guess is that they got paired with an edge driver that doesn’t do the same synchronization and that’s why smartthings marks them as off-line even though they still probably work.
Or it could be a missing repeater. 
@philh30 might have some thoughts, he’s done a lot with Jasco’s Z wave switches. 
If you’re referring to the old issues regarding Hail and polling due to the patent, I think that’s all handled on some layer below the driver. At some point months ago I did a good bit of zniffing on my network and found out the hub was polling my legacy devices in ways that my drivers couldn’t explain. Frequent enough that I would’ve been concerned if I had more than a handful of them on my network.
Agree with those that have recommended a general exclusion to clear the device before trying to re-include. Those older devices may need to be brought within a few inches of the hub to get include/exclude to work.
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That’s the one. The ST solution was unique to their architecture, not part of standard Zwave. Some hubs from other brands don’t even try to synchronize those old devices— they just tell people if they want accurate status in the app, they have to get a newer model.
Jasco usually says since that line has been discontinued, it is what it is. they were designed in the days before almost everybody had a smart phone.
You can see some of the remants of hail/polling in the old DTH’s, with conditionals for firmware versions. I assume this is when they brought that logic into the firmware itself rather than it running in the cloud. I’m guessing all that logic is still in place at the zwave level and continues to work with Edge on top.
