Scraping proxies shouldn't be semi-dedicated at all. You probably have a new noisy neighbor burning the proxies before you.
Your settings. Did they test good at the start? Did you even test them? Are you scraping with all 10 simultaneously? What kind of time delay? Are you scraping very obvious footprints?
Cheers.
Well, you may have right. What do you suggest? Buying private proxies? As i experienced public proxies are just a waste of time and never found good ones that would be working.