[wta] TCP/IP often disconnected intermittenly on RB 450

Im combining overseas connection n local connection (adsl ISP + wireless ISP) with my RB 450,
The configuration work nicely, I can connect through both gateway, browsing, gaming normally
but sometimes my client disconnected, it happened often, about 30 minutes or 1 hour, sometimes after restarting client…
I can access mikrotik via winbox only(via MAC), cant ping client with IP address from mikrotik, only with MAC address ping

connection between client A n B is normal, both can share files n folder, but cant access the gateway wich is 10.0.0.0/24
If I reinstalling the network card client (winXP) , the connection back to normal, but not long after it disconnected again;
ping to gateway said destination specified is invalid




Ive tried reinstalling network adapter, but the problem still exist
Ive tried using TCP/IP Speed optimizer software, moving ethernet port
putting mini fan to my RB 450 wont work also

this is my configuration :

/ ip firewall mangle
add chain=prerouting src-address=10.0.0.0/24 dst-address-list=nice
action=mark-connection new-connection-mark=mark-con-indonesia
passthrough=yes comment=“” disabled=no
add chain=prerouting src-address=10.0.0.0/24 dst-address-list=!nice
action=mark-connection new-connection-mark=mark-con-overseas
passthrough=yes comment=“” disabled=no
add chain=prerouting connection-mark=mark-con-indonesia action=mark-packet
new-packet-mark=indonesia passthrough=yes comment=“” disabled=no
add chain=prerouting connection-mark=mark-con-overseas action=mark-packet
new-packet-mark=overseas passthrough=yes comment=“” disabled=no
add chain=prerouting in-interface=“LAN” packet-mark=overseas
action=mark-routing new-routing-mark=adsl passthrough=no comment=“”
disabled=no

/ ip route
add dst-address=0.0.0.0/0 gateway=222.222.222.1 scope=255 target-scope=10
comment=“ISP Wireless” disabled=no
add dst-address=0.0.0.0/0 gateway=192.168.1.1 scope=255 target-scope=10
routing-mark=speedy comment=“Speedy” disabled=no
/ip firewall nat
add action=masquerade chain=srcnat comment=“” disabled=no out-interface=
Wireless
add action=masquerade chain=srcnat comment=“” disabled=no out-interface=
ADSL


My setup

Wireless ISP-- —> RB 450 3.28---- switch—>client A
/
ADSL ISP---------- → client B

Somebody please help,… :frowning: :frowning: :frowning: