Well, I've had this happen to me 4 times today, and I'm not alone it seems. When trying to zone to a system in an exploration zone, it will sometimes come up with "No Server Repsonse" and then kick me. I'll then be unable to login past character selection for about 5 minutes, at which point I'll find myself back in the exploration sector. It then appears that the first sytstem I do get into won't "Activate", ie, getting the pop-up at the start about what you need to do, and enemy ships won't spawn. Departing the system and then re-entering seems to "reset" everything, and I'm fine until the next time this happens.
This isn't a whine per se, more a FYI, which is why I thought I'd put it in this forum for a bit more exposure to other people experiencing this problem. Would like to get a response from the devs about why this is happening, but I doubt it. I can only guess they run out of nodes or something to create the instance on, as the server itself doesn't seem to be crashing. I also get the "No Server Repsonse" for other systems, but it's only brief and does kick in after a few seconds, which is why I've labelled for exploration zones, as that's the only time my character gets stuck for a few minutes. And yes, I've sent a bug report.
Maybe it's a feature to attempt us to take regualr breaks!