Well smon shouldnt free temp extents in a temporary tablespace so may I ask if your tablespaces status is temporary or permanent? If it's permanenet change it to temporary and you should see a boost in the perfomance database wise

Regarding loose connection with svrmgrl, write a shell script then you can either put it in crontab or do

nohup your_shellscript_name

this way even you lose connection the process will keep on running

look man nohup if you dont know what it does