Thanks for all the advice. Setting the comments about Vne and Airbuses
aside for the moment...

Yes, these are Schempp-Hirth spoilers on a 21 year old DG-101. What
makes most sense is the springs becoming weak and/or an air leak.

I will order replacement springs from DG. The overcenter for the
spoiler lock was specifically checked at the last annual.

On the air leak - I always carefully tape the wing roots but the
aileron gap seals are shot. I have new mylar seals in hand and will be
installing them in the next few days.

After that work is done I will report back.

Thanks again, John