inactive problem, more than 30 units

Hi, I have a problem. When I have less than 30 units the software works very well, but when I add more than 30 the units start to be inactive in red, then after a while they become green and others are turned off.

Also in some occasions in the list of last update is frozen and does not update the hour.

I have a core duo machine of 2.4, 4 gb ram, 500 gb, windows 7, 20mb internet speed

Gps tk103.port 5002.

I hope you can help me Thank you

i forget to mention, im using mysql database.

And all gps interval time 60 sec.

It sounds like you have a problem with the device. How is it related to the server?