Well worthwhile determining if your code has a known bug, hopefully fixed.
That aside, 3 things to remember concerning high CPU on a switch.
1) unless it is something like the IP process having the high CPU, data plane continues to forward traffic, normally, regardless of CPU level.
2) software processes generally are prioritized, so a lower priority software process, usually has almost nil impact to any higher prioritized process.
3) although you mention CPU is constantly above 70%, that still leave about a 30% cushion. So, if the 70% is a fairly consistent usage average, might mean there's little adverse impact.
Now the forgoing, doesn't mean you shouldn't try to resolve this issue, if possible, but also there's a good chance it is not too problematic (not that you said it was).
