My S7 has started loading albums and images super slow! Otherwise performance is fine

Hi folks.

I have a totally stock phone and I have been running a san disk 128gb micro sd.
I pretty much put all my media on the ext sd and therefore have lots of memory on the phone itself. I am using about about 30gb out of the 128bg.

Anyway recently my phone is struggling to load images and gets stuck, videos are stopping sometimes. I removed the sd and did a factory reset to no avail. My next move is to format the sd but I dont want to do that because all my pictures are on it and I have no way of transferring them to my laptop.

Anyone can help?:)

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