I have some reservations about your design. Mostly, if you wanted to add a manufacturer name, you'd need a new tab on your control, correct? This means that the form (at least) isn't correctly designed. Be that as it may, if you want to keep it as such, you could compact/repair and zip a copy of your db and post the db in your thread. Since I now have 2016 I could at least let you know if it's a problem with the db or perhaps it's a pc problem for you, based on whether or not it exhibits the same behaviour to me. I might have design suggestions as well.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.