Play Store Stuck on Downloading

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http://forum.xda-developers.com – When I first installed apps to my infinity, the play store was fine. After i performed three or four factory resets, now market stucks at downloading apps at some point. If one app gets stuck at `Downloading` , that`s it: you can`t install it from the store anymore. It always gets stuck Sometimes it follows this pattern one app gets stuck --> cancel download manuall the next one installs fine the next gets stuck --> cancel download manually the next installs fine so on and so forth Do you experience this? do you have any suggestions? I tried rooting and replacing the play-store (HowTos)