There are a LOT more people online lately, as one might expect. As someone who does a fair bit of exploration, I’ve noticed that all manner of sites, both signatures and anomalies, are very thin on the ground.
Perhaps CCP might consider boosting the spawn rates in the short run; scale the rates to the average number of players (yes, this a bit of self-interest going on here:).
The way most sites work is that when a site despawns (usually because you hack it, but they’ll also despawn after a few days if you just initiate warp to it) it’ll immediately respawn somewhere in the same region.
You can’t increase spawn rates further than “immediately”.
What happens is that the areas of space that see a lot of travel are cleared fairly quickly, while the areas off the beaten path start accumulating sites.
It’s called exploration for a reason, go out there and explore!
One of the ISD team will close it for you if you ask in the thread or report your original post and go to other reasons and ask there, reporting it will probably work faster.
My experience is that sites despawn after 45 minutes or so after you’ve visited them and hacked at least one can. This comes from mining in sites after I’ve hacked a few cans. Right in the middle of mining everything just disappears. I had thought the site would exist as long as you are present, but that is not the case.
So, if each site respawns in another system within a short time in the constellation you are in (as I have been led to believe), it should be reachable. If it respawns immediately just within the region as Trevor says, it’s a crap shoot.
Check map stats and look for systems that have low amount of population, low amount of jumps, low amount of NPC kills, etc, you’ll have to do some traveling but you’ll find a lot more sites to run.
If you hack all but one of the cans in a wormhole non-sleeper Relic or Data site within 3/4 hour before downtime, all the cans will be full again (and can be hacked again) when downtime finishes.