Twinbeard says:
Helldivers!
As many of you have noticed, something has been off with patrols and spawn rate for some time now. This primarily leads to more enemies rearing their ugly heads than they're supposed to, indirectly to players feeling overrun, kiting, and subsequently less fun gameplay. This has been the case for all players, but predominantly for smaller teams and solo playing. We've been aware, but frankly, the past couple of weeks have been so hectic that we haven't been able to give this the TLC that it required. We now have, and we've concluded that it's not working as intended and we're changing it. There might be some minor tweaks, but overall we're reverting back to how patrols and spawn rate worked before the patch that changed them a few weeks ago. We believe that this is more or less how you currently want them to be.
We also know you want us to do things and changes properly instead of rushing them, and we do as well. Therefore, implementing this will take some time. We want to give it proper testing and review it ... ah heck, simply see that it works this time. Even if this means we're faced with more bugs and bots than even the bravest of citizens would deem realistic for a while longer, we hope you're happy with us fixing the problem.
Onwards and upwards!
Their initial communication was something like "if you're solo, patrols spawn at 1/6 the 4-man rate instead of 1/4 - so we're changing it." I don't think that was a good idea since the game doesn't scale linearly as you add more people.
But yeah, when they went from 1/4 to 100% on accident, that wasn't cool.