Some apps can't connect to the internet

Hi I've been using dmod v6 for already a week but now my play store, facebook, fb messenger, gmail, and youtube can't connect to the internet but stock browsers, online games and apps downloaded from play store can connect. I don't really know what happened since i only used my phone to play games and search the internet didn't touch any settings too. and also when i surf the web there something that pops up something with cerfication error. Any ideas? pls help :(

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