I have a large envelope delivery made each week from Chiang Mai to Phangan (since 2 years now) and suddenly about 3-4 weeks ago, started to experience delays. The EMS envelope posted each Saturday morning from Chiang Mai always, like clock-work, was delivered to me here on Phangan the following Monday afternoon (3 days). Now, however, it arrives 4-5 days later (and this week not yet received at all)! In viewing the tracking online it shows that it arrived on Phangan at final destination on 14 March (today is 18)! I went to my local post office and they apologized (owned up) with the reason given as too many packages arriving in Surat Thani (more than they apparently have the man-power to handle destined for Samui/Phangan/Tao... So, the delays afore-mentioned are also involving Thai Post. Perhaps the enormous influx of tourists here after a nearly 3 year (blissful) lull may be overwhelming services - everywhere in the world is experiencing post-Covid staff shortages
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Incidentally, I had a delivery issue with Lazada about 2 months ago and the customer service rep on the phone told me they have many, many calls regularly about delivery issues on Koh Phangan..