There may be of lot to be a reason for it!
And it can be narrowed down into two parts,
The first one is easy to resolve, it just needs few clicks. But, sorry man, for second one you need to change your hardware or stops using the services you currently working with. Sometimes you may also need to add extra RAM for resolving the memory issue. I recommend you to clear the temp files, browsing history and cache files and then restart once. If you still have the problem get an extra RAM.
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