If nobody has said it yet, welcome to the Rogers Community Forums! 🙂
This does not sound right - I have used a 25 foot HDMI cord with success. Can you check the coaxial/RF cable running from the wall to the Nextbox - is it screwed in tight, or is it loose?
The only thing that comes to mind, I can't really speak to, but maybe @57 or others could advise you on choice of cable - not all HDMI cables are the same.
The other thing is you could call in to tech support, or chat (probably wait for the load to drop from the cell phone plan offer), and ask them to check levels, and you could also mention the excess cable too.
I do know they often put in extra cable so you can move your set up around - mine is curled up in a hoop and twist tied behind my TV stand, that is if you have some place you can hide it easily.
@57 maybe you can guide him to how to check signal levels on the box - these are often an issue too.
Welcome to Navigatr, there are lots of tips on here and lots of people who are well experienced with the boxes who can help you, along with using tech support.
One thing that may help people more skilled at these questions than me (I have never dealt with the HDMI cable issues), is what brand and model of TV do you have, and which box do you have. Answers can differ depending upon box and tv.
Hope it gets worked out, I am sure it will, Bruce
@JC14 : Most regular HDMI cables are 28 gauge. These are acceptable for lengths up to 10', perhaps 15'. If you need to go 25', there are two choices. You either need to purchase a thicker cable, like 22 gauge (24 may work at that length), or you need to purchase an "active" HDMI cable that uses something like RedMere technology. The latter cables are "one way" and are not "passive" like regular HDMI. These typically cost more, although if you do a search online, they can often be much less expensive online than purchasing at a store.
You may have issues that go beyond the HDMI cable though, relating to the signal coming to your home or neighbourhood. Here's a post on that topic: Call Rogers and have them check the signal - they can do this remotely and you can also check it using the link below.