I didn’t notice the "Same results whether using my WiFi or on other WiFi’s about the town/work, etc. "
You will seriously want to connect the mode/router via CAT5e minimum.
Cat 5 is the slowpoke of the bunch. It can handle 10/100 Mbps speeds (Fast Ethernet) at up to 100 MHz bandwidth.
Cat 5e (Cat 5 enhanced) is currently the most commonly used in new installations. A step above Cat 5, it can handle 1000 Mbps speeds (gigabit Ethernet) at 100 MHz.
Category 6 is a major improvement over Cat 5e. It’s really just the bee’s knees. It’s suitable for up to 10 gigabit Ethernet at 250 MHz. To even better tackle the issue of that pesky crosstalkin’, Cat 6 cable has an internal separator that isolates pairs from one another. For those who want to “future-proof” their residential or commercial network as much as possible without a significant cost increase, Cat 6 is a great choice.
Let me know when you get home what video and audio codec they are, the container and the file size. Also, I assume you have DLNA turned on via the WD Cloud? Have you also tried to rebuild and rescan the DLNA database?
Also, what app are you using on your iPhone to play/view the videos? Do you also have an iPad to test if the issue persist on the iPad?
What app are you using on your Mac to view the videos?
Its likely a codec issue as the iPhone/iOS doesn’t support a lot of audio and video codecs, while my 2012 Samsung TV (non-smart TV) supports more than my iPhone 6.