constant tick data ?

Hello... excuse me if is a stupid question... but
is it normal that the charts sometimes are not updated as if the streaming tick data is not being received?
and suddenly... the prices start moving again and changes more frecuently ? I thought that the streaming of tick data should be constant every second.... but for some demo accounts I have tested... in all of them there are like... stops of streaming data... and I'm sure it is not a problem of my internet connection.
Thanks

Hi Emda

You did not state what type of charting platform you are using.

Good Luck

sorry...
I tried with Visual Trader (cmsforex demo)
and Meta Trader 4 (interbankfx demo)
maybe is not a problem of the software but the broker ?