Problem with stack between X250 - X440

[Leonardo_Falcon]

Hello people,
I have two switches in stack.
The switches are X250e-24t and X440-48p.
The version is 15.3.2.11.
This stack has two ports in trunk configured in sharing to the switch core.
The spanning tree is not configured in this network.
One week ago I had a problem because there were a l2 loop.
I think it was a stack problem, causing the misconfiguration of the two ports in sharing and lease two trunk actived.
What do you think?
Are there problems if I do a stack with two platform different?
If I upgrade the version, Can I resolve this problem?
Thank you.

[Leonardo_Falcon]

Hi Drew,
I have upgraded the version and until now the problem is not appeared.
Thank you.

[Drew_C]

Hi Leonardo,
Were you able to resolve this issue, or do you still need assistance?

[Ronald_Dvorak]

could you share the output of "show stacking"

[Vellachery__Sum]

Leonardo,

Adding to my colleagues suggestion (Karthik). Also, look for the stacking port Rx errors & Tx errors are getting incremented:-

• show ports stack-ports rxerrors no-refresh
• show ports stack-ports txerrors no-refresh

In case, if the Rx errors are getting incremented. Check stacking cables for good connections, firmly connected with the screws tightened.
If you have a spare stacking cable. Try swapping them with the spare one and monitor the stacking ports Rxerrors