Soundbar connected through optical cuts out

I've got the Polk Magnifi One. Worked fine for about 12 hours.

I've got it connected with an optical cable wired straight to my TV. The stock optical cable only works if I physically push and hold the connection point. Third party cables don't work at all as they just don't seem to insert into the sound bar. The sheathing just gets in the way.

Bluetooth audio works fine and the optical connection works fine until it decides to cut out.

Is there a cable out there that fits into this thing properly?

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