[Q] data packet problem

HI

I have galaxy tab P5100

While browsing the internet somethimes the page will stop loading and it says there is no connection,
same when i'm tethering via usb or wifi to my computer and i'm playing online game it disconnects me
every few minutes and i have to wait untill the connection is restored
It happens so often i can say it's a big issue

I can see the small icon 'H' and green arrow flashing but there is no connection
Then after a while it switches to '3G' then 'H' and finally to 'H+' and the connection is restored

I've read that 'it's a well knows bug' and tried some solutions but nothing helps
I'm sure its not the network as i've used sim card from Three,T-mobile and Talkmobile
everytime same problem

Please maybe somebody had same problem and knows how to fix this