One device has connection problem, but not others

Hello,

Airdroid works fine on several devices here (my phone, my son's phone, my mother's tablet), but is very picky on my mother's phone.
She has a samsung GT-S5839i. Here's what happens:
First, after installation, connection was ok.
Next day, no connection, the browser could not reach the phone. My phone could connect (over same wifi network, same browser on my PC). I restarted her phone, launched Airdroid : works fine.
Today, one day later: everything the same: not working at first, I had to reboot her phone.

So she has to reboot her phone to use Airdroid, that's not very convenient :-/

What could cause this? How can I investigate this issue?

Thanks a lot ^_^

Hello,

Do you need more information regarding this problem, in order to help me?

Thanks ^_^

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