Valery, sending me a message this afternoon, confirmed about a problem with the PMS during last week. The Commander re-powered the TNC and all seems ok.
Several messages are stored since this morning on the PMS.
Here the message from Valery Korzun:

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Ciao Claudio!
This morning I check my PMS and read your message. Before I recycle power on
PMS. It's a pity I didn't know about PMS stuck. Thanks for your inform!

73 Valery
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Enjoy the PMS and digipeater is ready for the dual hop test ;)

73 IK1SLD Claudio