Grandstream gxp 2140 MWI inconsistent messages waiting

We use Grandstream phones with FreePBX because they’re much more affordable than others. But we have erratic behavior with them.

This time … the MWI (message waiting indicator) lamp sometimes blinks after a message is left. Other times it waits several days before blinking.

I’ve tried adjusting the Extensions > someextnum > Advanced > MWI Subscription Type …

with Auto - it sometimes works properly
with Solicited - it sometimes works properly

Can anyone suggest other settings to check - either in FreePBX or on the Grandstream phone?

Thanks in advance, Jason.

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