Forward Traffic log saves only 127 entries

Hello Dear Forum ,

recently my client has been complaining about the fortigate not saving

entries containing more than 1 destination address ,

my client has a couple of servers that have traffi to them,

also the logs are being sent to a syslog server - which the syslog receives

all the other logs.

(this is a VDOM , therefore can't make any changes on a global

level since the affect would apply to other clients as well)

after checking the Forward Traffic log , i've noticed that there's only 1 Destination IP indeed.

i tried changing the severity on the memory filter to information , and

it seemed to have worked and showed traffic destined to other addresses as well,

yet a while after they were gone .

please help me with this  , how do i keep the logs from getting removed and how do i keep

more than 127 entries .

thanks!