What is the best stock trading (broker) platform for setting "custom" alerts?

I am a trader with $10k. I have determined that I want to move my money to Interactive Brokers because their commissions seem to be the lowest for the kinds of positions I'm trading. I was also planning on continuing to use thinkorswim because I like to use their thinkscript to create custom indicators and then set alerts to these indicators.

The only problem is that thinkorswim's server/data can be very unreliable. For instance, right now all of my custom indicators are not updating properly so I am unable to receive alerts. I have talked to ToS trade desk and they have confirmed that it is a problem with their system that they are "working on" but seriously any institution that deals with money shouldn't have these sorts of outages even with minor services like a customer's custom indicators. Their software is great but I'd like to have something similar with another company that is more reliable and will allow me to receive alerts even when I'm away from my computer.