My EA's kill switch: the three conditions that stop it for the day

[FXS London Scalper]

Every EA I run live has a kill switch that stops new entries for the rest of the day. After some trial and error, I've settled on three conditions.

• Daily loss of 2R or more, counted from closed trades plus floating loss on open ones. Once reached, open trades are left to their stops but nothing new opens.
• Three consecutive errors from the trade server, such as off quotes or trade context busy. That usually means something is wrong with the connection or the broker, not the market.
• Spread above three times its median for more than five minutes during the session. That's usually a sign of a liquidity problem or news I didn't filter.

When the switch triggers, the EA writes the reason to the log and sends a push notification to my phone through the terminal.

The second and third conditions caught problems I wouldn't have noticed: once a broker server issue, once an unscheduled news event.

The important part is that the switch can't be reset by the EA itself. I have to change an input manually, which forces me to look at what happened.

What conditions do you use for stopping an EA? Do you include anything besides loss limits?