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Inspect the plant for signs of Scale pests. Weigela can be susceptible to infestations and leaves may yellow and then drop off the plant.
Heavy infestations can kill the plant.

Neem Oil can be used to treat these pests.

Check the watering. Weigela can be susceptible to crown or root rot. Make sure the soil is well draining.

Here are some links with more information.

https://www.gardeningknowhow.com/ornamental/shrubs/weigela/growing-weigela.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

This is a Weigela shrub.

https://www.gardeningknowhow.com/ornamental/shrubs/weigela/growing-weigela.htm

The best time to do rejuvenation pruning is while the plant is dormant in late winter. Avoid allowing the plant to use up a lot of energy to leaf out and then cut it down. That would be the worst thing you could do. The best time to prune dead, diseased and crossing/rubbing branches is right away regardless of time of year. I often rejuvenate shrubs with a 3 year plan. I remove the 1/3 of the branches to the ground, removing the oldest ones right after the shrub is done blooming. (No later than June 30 for spring-flowering shrubs) Do this for 3 years and you have a new plant and don't have to go through the awkward look of a total cut down. Most blooming shrubs benefit from annual pruning. Old wood doesn't bloom or leaf out as well as young wood. Prune summer-blooming shrubs in early spring.

These should be pruned in late spring to avoid destroying the next seasons flowers, as they flower from older wood. Trim these branches by only 1/3. This article will help:https://www.gardeningknowhow.com/ornamental/shrubs/weigela/pruning-weigela.htm

I recommend taking several cuttings just in case. there are several ways to take cuttings. Take multiple tips about 6-8 inches long, and cut them at angles on the bottom. Dip the ends in honey, and place them in some light soil mix, or peat moss, and perlite mixture.

Next, mix a spoonful of honey, and a crushed aspirin tab (preferably non-coated) into a bottle of warm water. Water the new cuttings with this mixture.

You will want to keep these new cutting moist, not wet, or dry but in between. Cover them with plastic if they dry too fast. Wait one or two weeks, and gently check for roots. Keep in this mixture until you see roots, then transplant.

Here is an article for more information if you wanted to use other hormones: https://www.gardeningknowhow.com/ornamental/trees/tgen/how-to-root-cuttings-from-various-shrubs-bushes-and-trees.htm

You will want to prune these in spring right after they get done flowering, as pruning now will likely damage the blooms for next year. Here is an article that will help: https://www.gardeningknowhow.com/ornamental/shrubs/weigela/pruning-weigela.htm