Some Questions:
1) What kind of suspension do you have, shocks, springs, air bags, hydraulic?
2) Does the trike sit lower than it used to? Is it levels now, right compared to left?
3) Did you put wider or taller tires on recently?
If #2 & #3 are no, almost has to be the suspension. Weak springs, Loss of air, hydraulic leak. If #2 is yes, look at #1. If #3 is yes ... you need to switch back.