Code with for loop suddenly started to run slow on Matlab R2021a live editor. Why?

I've been facing an issue with R2021a where my code in live editor has suddenly started to run slow. This happened once before too when I woke my PC up from sleep and a loop that should've taken 150s to run now takes 900s-1000s. Back then, restarting Matlab didn't work but restarting my PC did. Now I ran into the same problem of slow code but even restarting the PC doesn't work this time around. Before I get any questions about pre-allocation - Yes I have all my variables pre-allocated for speed.

Is there anyone else facing the same problem?

[TED MOSBY]

Please share your code as it is not possible to assume what might be the issue without that!