Is it now save to upgrade to 4.4?

Since some of my friend said after she upgrade to 4.4 the wifi is become bad...

And one have problem after upgrade to 4.4 ?

Please explain the problem clearly help to facilitate the best ....
Try using the built-in keyboard to play a password and then re-connect look .....
Another possibility:
After the upgrade 4.4, wireless network settings in the "During sleep mode to keep WiFi Connection" from "eternal connection" was changed to "Never connect (increased data usage)," Never even been changed after the line, the phone started by hibernation, often occurs wireless network connection can not be normal, I think this should be trying to reduce power supply expendable, but just the opposite, but let the phone with a wireless network connection is not normal, you can see the phone set on what?
I hope to help you ........!

thanks
I will tell my friend and check if it may be save for me to upgrade to 4.4