Timing Problem with default Configuration RB2011UiAS-RM

RouterOS Beginner Basics
1

Hello,

I have Timingproblem with a STB (IP-TV Box), it runs 10 second than freez the picture. I can look on my Notebook TV-Streams with no freezes. any ideas ???

2

Bad set top box. No info => any ideas.

3

The STB works fine with the Provider Equipment. I think it is a Timing Problem from the Firewall or Bridge.

Configurations in Cisco comand from cisco router.
ip dhcp client hostname own-hoempf-endpoint
ip address dhcp
no ip redirects
no ip unreachables
no ip proxy-arp
ip pim sparse-mode
ip nat outside
ip virtual-reassembly in
ip igmp query-max-response-time 8
ip igmp version 3
ip igmp query-interval 10
ip igmp querier-timeout 60
no cdp enable
end
interface Vlan1
ip address 192.168.10.1 255.255.255.0
ip pim sparse-mode
ip nat inside
ip virtual-reassembly in
ip igmp helper-address 1.1.1.1
ip igmp query-max-response-time 8
ip igmp version 3
ip igmp explicit-tracking
ip igmp query-interval 10
ip igmp querier-timeout 60
end