how long are you running before it starts freezing?
how many torrents do you have in the program? what is their status (downloading, seeding, standby, queued)? are they active?
are you connected to any channels? are they large channels or channels that stream?
look at the diagnostic graphs, they are under help->diagnostics.
are you sending in crash reports? thats the best thing to do.
try the newest alpha and see if this is still happening.
https://testing.tixati.com/