Latest Google Chrome troubles: tabs reload automatically

Currently I have Google Chrome Version 49.0.2623.87 m.

Approximately everything is okay with me before 1 month. But currently I am having a trouble with my Chrome Browser. I have Win 8.1 and Core i-3 Dell Laptop. Ram 4GB. Every tabs get reloaded when I am another page/app/window. Any help may appreciable. Thanks in advance.