Hi there,
I have 2 campaigns on adcenter that started out great, and after a few days i got QS between 8 and 10 for all the 40keywords i was using, and today no traffic at all so I check QS and it's now 3 for all of them .. of course i changed absolutely NOTHING in between !
Have you ever experienced this ? Any taughts ?
Mehdi
This usually happens when your competitors have made adjustments and their CTR has increased. As a result, your QS falls due to a lower CTR compared to their numbers.
it's weird because my ads and landing pages are close to one of my competitor's and he always shows up in our keywords !
it's a single page, with privacy and terms, and only one link to a software download.
the LP is super relevant, it presents the software, and provide a clear link to download it, nothing sneaky here !
but still it says that :
http://i.imgur.com/8jzkZ.png
Mehdi
this happened to me once , what i did is i stuffed the keyword on the landing page
i added all the keyword on the title , description , keyword , on the footer , and also i added them in the body and i set it to hidden from CSS i got my QS back 
if you want PM i have a good video will help you out with this
Hey andrawisnaser ,
I think that might be it, because on all keywords the only problem is "landing page relevance" so i think yes it could be related to keyword density somehow .. and here's me thinking it would be obviously better to play it clean, since LP is very short and clear, but okay i'm gonna try that and feedback on it here.. I would love for my volume to come back!!! 
PMing you too for the vid, thanx 
Mehdi
Great , but don't forget when you start making money back split it with me LOL
replying now
Ops i can't send you a msg as i have less that 10 posts
anyway you can add me on skype andrawisnaser
I accepted you on Skype mate, thanx 
Mehdi
Just to feedback on this, it worked like a charm and i have my old QS back!! 
If that happens to you :
- increase keyword density on your LP (title, metas, body ..)
- delete campaign
- resubmit the exact same campaign
Mehdi
yeah, it's great that adcenter is transparent about QS - they pretty much tell you everything you need to do step-by-step in the help section to solve any QS issue.