Yes, the Pfizer factory in Belgium, which supplies the UK & other European countries, is cutting production for a while while modifying the plant to increase production capacity. Looks like bad planning to me. They're telling customers they're going to have to wait for ordered vaccines to be delivered, which is making a lot of governments very annoyed. With orders on the books, why wait until now to boost capacity? Why not months ago? Why not find a new site instead of disrupting production at an existing one? I'm sure governments would be eager to facilitate that.
AstraZeneca also has a delivery problem, though I think that the reason is different. Its Belgian & Dutch factories haven't been able to expand production as much as planned*, & is telling the EU it can't deliver as many doses as promised in the next two months. Its British production facilities seem to be successfully increasing production, but AstraZeneca says that was all booked by the UK before the EU contract was signed.
*Apparently they're getting lower than expected yields of the adenovirus that's used as a vector. Until that's sorted out their vaccine production will be less than promised. Yields at the UK factory (factories?) are much better, up to target. Somebody's got to find the difference in what they're doing & fix it.