their system always down..

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greetings to all of you guys,to all who have an account at cashnhits PTC site,how will you evaluate them when it comes to earning and for a good strong site?i have an account here and i earned many times here,but there is only problem with their site or maybe to their system,because its often that their site usually down,and i am mad of that because i invest to have a good earning point but i sometimes i disappointed because i didn't earn for a day. have you experienced this to some PTC sites that you joined?how would you feel when you invest then their site often down for whole day?why?