Getting multiple crashes in minecraft a day (chunks of world vanishing)

Right this is my first time reporting a bug here, not sure if I'm doing it correctly either so sorry in advance.
My Minecraft keeps crashing, I play for lets say 20 minutes, no mods, no texture packs, nothing. The world I'm playing on begins to "flash". Large chunks of earth suddenly become see through, sometimes you can see the caves systems silhouetted below. leaf blocks also disappear in large chunks of areas. they flash in and out of existence several times in a few moments. It stops for a bit, then gets worse, and then the game crashes and I get a report.
I was getting this back with 1.9, I updated to windows 10 hoping to solve the problem that way, nope. re-downloaded Minecraft hoping that would fix it, nope.
My PC is a family computer thats been around for 3 or 4 years so its memory mightn't be great. Other programs and games seem to run fine like Photoshop or fez or TF2, its only Minecraft thats been having problems as of late.I'm getting this crash several times a day. Minecraft is my special interest subject (Asperger's) and having the one thing that zones me out and helps me with over stimming isn't working, thats not good, thats not good at all. Any help would be greatly appreciated on this subject.