If a program actually fits in memory and has enough disk space, it is guaranteed to crash. If such a program has not crashed yet, it is waiting for a critical moment before it crashes. No matter how good of a deal you get on computer components, the price will always drop immediately after the purchase. All components become obsolete. The speed with which components become obsolete is directly proportional to the price of the component.
Software bugs are impossible to detect by anybody except the end user.
The maintenance engineer will never have seen a model quite like yours before. It is axiomatic that any spares required will have just been discontinued and will be no longer in stock. Any VDU, from the cheapest to the most expensive, will protect a twenty cent fuse by blowing first. Any manufacturer making his warranties dependent upon the device being earthed will only supply power cabling with two wires. A failure in a device will never appear until it has passed final inspection.