I have consulted our engineer, the ultrasound machine seldom have problem, just take care the probe when routine use. Such as:
1. Please make sure the machine is Shutdown state when you join up the probe or pull out the probe. And don't shake heavy when pull out the probe.
2. Keep the probe interface dry and clean.
3. Put down the probe gently, avoid any impact
If you need more informations, you can also visit our website to have a look:
Proper use and maintenance of the ultrasound probe
How to solve the problem when the ultrasound display the snowflake stripe.