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NEED HELP with Packet loss in 2948g l2

Hi, I have a strange problem with my 2948g l2 switch.  The situation is: the provaider (connects me to a L3 non cisco)  gives me a gigabit link with 5 dot1q vlans (below 1000) for the internet and 1, which is 1200, for IPTV.   I've configured: vtp transparent , in  port 2/49 is copper gigabit GBIC (this is my incomming connection).

I've made a vlan map of dot1q vlan 1200 to isl 1000, because i can't add extended vlan id.

The 2/49 port is set to be dot1q trunk - nonegotiate, allow vlan 134,191-194,1000 native 1 .

Then i set :

port 2/1 -trunk - nonegotiate native 134, allowed 134,1000;

port 2/2 -trunk - nonegotiate native 191, allowed 191,1000;

port 2/3 -trunk - nonegotiate native 192, allowed 192,1000;

port 2/4 -trunk - nonegotiate native 193, allowed 193,1000;

port 2/5 -trunk - nonegotiate native 194, allowed 194,1000.

The internet is working fine, but the big problem is the IPTV!!! The TV  SetTopBox makes the connection ant works fine untill in one moment some of the packets are gone missing ant the tv stops after a little (30 sec - 1 min) the tv stars again. I've tryed to ping the STB from outside (on a port before the 2/49 from linux )  from time to time (no exact perioude) the ping stops and the tv stops too after 30sec to 1 min ir reasumes again, and so on and on. the problem is in the switch cose i've tried a ping to the provider's streamer when there is no ping to the STB and it was excelent. Any ideas what could cause that ?