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The shrivelled leaves might be due to frost, or to strong winds. As long as only a few leaves shrivel it will recover.
Depends on the acer, but probably not. They normally grow in the shade of trees, and subjecting it to the hottest sunshine is likely to burn the fine leaves.
If the wind was very strong, yes. There's nothing you can do other than wait for it to produce fresh leaves, which it should do if it's mature.
However, it's also worth checking that there are no vine weevil in the pot - they can also produce a sudden collapse.
We have over 30 Acers all in pots. We use terracotta and ericaceous compost. We have found the best variety for full sun without burning (our garden is south facing) is Acer 'Bloodgood'. Also, an answer to 'Goodmane', Acers can be subject to Verticillium wilt, which is soil borne and will cause collapse of what has previously been a healthy plant.
It will be much happier in a bigger pot, so yes, transplant it.
A shady position sounds ideal; just make sure that it doesn't get the sun at midday and obviously, keep it damp.
We have an acer in a large pot. It lost most of its leaves in winter but came back strong until a couple of weeks ago when all the top leaves shrivelled up. Its in a reasonable shady position and the soild seems moist, even wet after all the rain. It now looks very sad. Any ideas what is wrong and what we can do to save it?