@valathen 

When the extender has the issue, what is the status of all the LED lights? If you log into your router, does it still show the extender is connected?

Since having the extender close by, does it continue to have the same issues?

Try resetting the extender by holding the reset on the side for 10 seconds, then logging into it and uploading the firmware manually.: https://www.tp-link.com/us/support/faq/1406/

@valathen 

The signal strength at the place where the extender is -50dBm

The firmware is upto date to the latest available version.

The unit lights remain lit - the blue ones indicating good signal. I have connected using only the 2.4 GHz and the light in the extender is lit to indicate that it is connected. 

When the extender crashes, I can't connect to that device unless I reset the device. 

I get very good signal as the extender is sitting next to the router and the extender works for a day without any problem and suddenly crashes. I wish I can return this device.

Thanks and Regards

@valathen 

Warranty for our devices is two years from the date of purchase. You could probably get in touch with our support to see what they may offer.

@Tony 

Hello Tony

Thanks for the mail. One of the tplink support representative asked me to restrict the router transmission to a particular channel for 2.4 GHz and also restrict the bandwidth. I tried the setting and the extender worked for 2 days and now it crashed. It is un reliable as the extender seems to drop connection just when needed! The problem is nothing to do with the signal level as the extender is kept next to the router with more than -50 dBm of signal. 

I am working now to somehow return this extender. Spent all the time and tricks. Thanks

Valthen