Why are chrome tabs falling off?

Question

Google Chrome

Version 39.0.2159.4 beta-m (64-bit), win7 x64.
Every 20th tab definitely falls, although this did not happen 2 weeks ago.
The effect occurs when scrolling pages.
Do you observe this?

Answer 1

It generally falls often, I lost 20-30 tabs so often. Then I restored it from history.

Answer 2

Version 39.0.2171.27 beta-m For the
last 2 weeks, not a single tab has fallen, especially since chrome has not fallen, apparently fixed.