Virtuoso License Issue: status code -5.

Hello Everyone,

I am facing some issues when working with Virtuoso Suite.

Sometimes the program freezes for some seconds and the message below is shown in the main window:

*WARNING* (icLic-203) Failed to check out license Analog_Design_Environment_XL ("95210") to run ADE L because of status code -5.
Attempting to check out the next available license Analog_Design_Environment_GXL ("95220") per license checkout order XL, GXL, L.
*WARNING* (icLic-204) Failed to obtain sufficient number of tokens for token capability Analog_Design_Environment_GXL ("95220") to run ADE L because of status code -5.
Attempting to check out the next available license Analog_Design_Environment_L ("95200") per license checkout order XL, GXL, L.
*WARNING* (icLic-205) Failed to check out license Analog_Design_Environment_L ("95200") to run ADE L because of status code -5.
Contact Cadence Customer Support with the status code -5.

Sometimes this message occurs while opening schematic/layout or during simulation.

I am using IC6.1.7-64b.78 and  Spectre17.1.0.124 64bit. It is the Educational License.

Is there a way to solve this?

Thanks in advance.

Paulo.