Dhcp Offering Lease Without Success..Need Help

Hi

I have Got A problem That I cant resolve it
My clients not all complain from getting ip..
I use a hotspot

and every thing is working!!

Any Ideas?>?>>

See The attatch

This happens only with a client?
In my case happened with a client who had a computer that was the problem with viruses and in memory.
If no such cases pass details of your network.

HI

I have install 3.28 Mikrotik on Desktop 3.0 GHz
and i use a switch in the switch 3 nano2 have been installed

I am sure my clients has clean computers(newly formated) and the antivirus is updated

i think that because of long distans signal
they are 2km far away from me and the act timing has set to 48