What factors? Your comment doesn't mean anything
Per example, on how many proxies are you using. In your geolocation, in the number of threads that you are using, etc.
I posted here, a few weeks ago, a case sutdy, that a customer ask us to run his project in our own VPS and with our proxies.
We make a LOT of daily click for him, using 10 backconnects from Microleaves, without the need to use much DeatchByCaptcha.
We where running ONE projecvt with ONE keyword and something like 8 threads. We make a huge amount of daily clicks.
Even the user post here a good review.
A month latter -i have to thell always the truth- we found some problem with proxies, the user point our attention to this, we just restart everything and it start running fine.
Most of the examples i show here where made using Microleaves.
Once Stormproxies people contact us and ask us to offer it to our users, they lets us try for one moth the 150 threads package... and it runs excellent too.
It was amazing.
We do TeamViewer support on daily basis and in most cases we found, that the user does something (running too many threads per example, running many keywords, or running too many projects, etc) and the root of the problem is there in most cases.(99% of the times)
I cannot explain you here all the "wrong" settings that we have found, because there are a lot. Also sometimes it was not some wrong setting, but a bad VPS, per example, etc. Or many times people have installed and even running A LOT of software on the VPS. You can imagine that the performance that we found was terrible...
There are MANY factors, but almost every time a solution can be found easily.
I am not defending Microleaves, i don't know them, i am not associated or reseller, i don't receive any payment from they, i don't even receive "free" proxies. I am just a customer.
I am trying to explain that you can review many factors trying to find the problem. (It could be even having an old IE version, per example)
Using any backconnects, if you feel like they are not working fine, i think that you can ask them to change your backconnects and receive a new ones, and most backconnect sellers will do it.
Best Regards