People have died from drinking water. When they drink too much.
Trying to download 170 torrents my be a little excessive. It wouldn't surprise me if it used a couple GB (it is GB not Gb) of ram.
I am on win7 Pro, running for 2 days...seeding over 600 torrents, UL bw is maxed out at my limit of 1.5 Mb/s . I have a couple dozen incomplete torrents but none are active since none have anyone seeding them. With 48 hours uptime, tixati is using under 650 MB of memory. No sign of any leak there. If you are seeing a continued creep up and up on your memory usage, then it may be related to download activity.