If you want to observe all your quotes stream on the screen and be notified if some symbol has been freeze this solution might help you.

It has visual and sound notifications, flexible settings for different symbol and symbol groups, custom columns and much more.

You can connect any number of quotes sources and custom columns using C# expressions to archive any logic you need.

Main window

Application has been connected to the broker's server and to another demo and live servers. It shows: symbol name, bid, ask, current spread, average spread during past 30 minutes, maximum spread, bid/ask difference, ..., last tick time, latency, field to change maximum timeout to be reported, checkbox to skip checks for selected symbol.