Hi there @sleocvreetly,
Data speed can depend on a lot of factors such as traffic congestion. The signal reception on the other hand can be interfered by other devices that transmits or receives a wireless signal for example. All this to say that it'll be hard to really pinpoint what may be causing this.
Have you tried rebooting your device when that happens or even resetting your device network settings see if that would help? You can always reach our wireless technical support on live chat or on the phone here if you need this to be further looked into. We'll be happy to check this out with you! In the meantime, here's a link below that might provide you more information about your situation:
https://www.fido.ca/support/troubleshooting/mobility
