These algos/ execution systems must be closely monitored, especially when entering and exiting positions is automated. Any bug, logic error, or market anomaly can blow out your account.
A friend went on vacation for a few days, and left one of these systems up and running. He came home to find his account value cut in half!
Yea some errors might creep up. Hence periodic diagnostics reports (through email or telegram or slack) are quintessential.
Probably have to include more engineering safeguards; triangulate with different data sources. Depending on your portfolio size, you may also want to introduce a self-monitoring architecture across different brokerages - with the reconciliation done at your side.