tl;dr crashing programs and bsod on boot and recurring chkdsk on startup after multiple win7 reinstalls. ssd/ram problem?

So a few months ago after my computer had been running smoothly for a year or so before hand, it started to experience some issues such as becoming quite slow, programs crashing/failing to start, longer and longer boot times, and occasional blue screens on boot (win7). After a while it started running chkdsk on every boot and would delete some files and recover others. I decided to format the (ssd) drive that I was using as the OS drive and reinstalled win7 and have been using this installation since. This installation has been running fine but yesterday it took well into 10 minutes to boot, blue screened, then when it finally booted programs began to crash and became unable to start. Today however after running chkdsk on boot it seems to be running fine (despite a few corrupted files). A virus scan with both avast free and malwarebytes returns nothing. Is this a failing ssd/ram or something else?