Mooring arrangement capsizing

Hi there. when i run my simulation the time domain stop. the error show stop due to capsizing. how can i improve this as my model is very small. it is a cylinder with lenght of 3m and diameter of 1m. hope you can help. below is my code.

$
$ Analyze single floating Photo Bioreactor
$
$************ Set Basics
$
&device -oecho no
&dimen -dimen meters m-tons
&title Sample of Multi-Point Mooring on floating Single Photo Bio Reactor
$
$************ Insert Model
$
inmodel
&describe body ko
$
$********************************************* set initial condition
$
&instate -condition ko 0 0 0
$
$********************************************* define mooring lines
$
medit
*mla 1.5 -0.5 0
*mlb -1.5 -0.5 0
*mlc -1.5 0.5 0
*mld 1.5 0.5 0

~wire b_cat 20 -depanchor 50 -len 200 -buoydia 0 -wtplen .0125 \
-c_sn wire
connector a -anchor -45 20 ~wire *mla
connector b -anchor -135 20 ~wire *mlb
connector c -anchor 135 20 ~wire *mlc
connector d -anchor 45 20 ~wire *mld
end
&connector @ -a_tension 100
$
$
$****************************************************Enviroment data
&set Hss = 0.001
&set heads = 0
&set Tpsmx = &number(sqrt %Hss%*30)
&set Tpsmn = &number(sqrt %Hss%*13)
&set Tpsmd1 = &number(real %Tpsmx%+%Tpsmn%)
&set Tpsmd = &number(real %Tpsmd1%/2)
&set Tps = %Tpsmx% $%Tpsmn% %Tpsmd% %Tpsmx%
&set WSPEEDS = 0.001 $10 15 20 $************** KNOTS
&set cur = 0.5144 $************** m/s
&SET TSPEEDS = 0 $0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.5 2.0 $************** KNOTS

&set time = 500 $ times=1800 for full run
$
&loop ii 1 &token(N %Hss%) 1
&set Hs = &token(%ii% %Hss%)
$
&loop jj 1 &token(N %WSPEEDS%) 1
&set wind = &token(%jj% %WSPEEDS%)
$
&loop kk 1 &token(N %TSPEEDS%) 1
&set towsp = &token(%kk% %TSPEEDS%)
$
&subt Tow Resistance Hs=%Hs%m, Heading=%heads%deg, Tp=%Tps%sec, Vwind=%wind%knot,Towspeed = %towsp%knot, Curr = %towsp% m/s
&type
&cutype Hs=%Hs%m, Heading=%heads%deg, Tp=%Tps%sec, Wind=%wind%knot, Current=%towsp%knot
&type
&stat f_connector -both
&even 3
$&eofile

&ENV NULL
&ENV %heads%_DEG -SEA jonswap %heads% %Hs% %Tps%/1.2958 3.3 -wind %wind% %heads% -current %cur% %heads%\
-tim %time% 10 $ -water 997*9.8066500286389
$&equi -maxit 9999
&status env
&status env -h
&status forc -h
$****************************************************** TIME DOMAIN
&ENV %heads%_DEG
TDOM -new
&DCPTIME Time For Time Domain
prcpost
trajectory -EVENT 0 %time% $150*8.366*2 0.5*2
vlist
statistic 1 5 6 -ha
plot 1 5 6 -no_edit
$end
report -EVENT 0 %time% $150*8.366*2 0.5*2
end

CF_MAGNITUDE -EVENT 0 %time% $150*8.366*2 1
$
$
vlist
statistic 1 2 4 6 8 -ha
plot 1 2 4 6 8 -no_edit
report -EVENT 0 %time% $150*8.366*2 0.5*2
end
end
&endl
&endl
&endl
&eofile
$&fini