Re: "AirPods issue: I've had my Airpods for a while now,
but this week I've been experiencing some issues with them."
You may want to check whether there is a firmware update available that hasn't yet automatically updated: See: About firmware updates for AirPods - Apple Support
Tip if needed: Leave AirPods connected to power overnight with the iPhone connected to wi-fi close by, so they can update automatically, (or use a Mac to update the firmware more quickly).
Else: If the latest firmware update is already in use, the below articles may help trouble-shoot
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Re: "They keep disconnecting and reconnecting"
See: Resolve Wi-Fi and Bluetooth issues caused by wireless interference - Apple Support
or
What to do: If your AirPods or AirPods Pro won't connect - Apple Support
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Re: "sometimes when I play a video or song, there's no sound".
Check the sound has not been muted, and do not disturb, or silent, is not on, on the connected device or Mac.
You may want to browse through the support articles below for tips:
AirPods: Pause, skip, and adjust volume with your AirPods and AirPods Pro - Apple Support
iPhone / iPad: Customize headphone audio levels on your iPhone or iPad - Apple Support
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Re: "the sound quality has started to glitch and cut off, and the videos stop every 10 seconds or so".
Check your device or Mac has enough free memory / storage space to operate smoothly.
How to check the storage on your iPhone and iPad - Apple Support (eg: At least 8 Gb free)
or
See used and available storage space on your Mac - Apple Support (eg: At least 50 Gb free)
See: If the sound from your wireless headphones cuts out or is distorted - Apple Support
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If more help is needed:
Resource: AirPods User Guide - Apple Support
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More support, info. etc:
AirPods Support Website:
Find all the topics, resources, and contact options you need for your AirPods...
AirPods Support - Official Apple Support
All the best :-)