Generally, the RPi4 has all 4 USB ports tied into a single PCIe lane limited to 4Gb/s (the SD card uses USB also). The whole Pi, has a max current limit of 1.2a, including board power, and whatever goes out the USB ports. This is why so many people have trouble running gear off the Pi's USB ports.
So, a good first step for problems with all USB gear attached directly to the Pi, is to move it off to a powered hub. Consider that any form of disk write, including images, temporary files, etc, are going to use a lot of USB bandwidth, and since USB 3.0 has a limit of 5Gb/s, and the Pi can do only 4, directly attached devices that use both current and bandwidth (like Cameras of any sort) are an iffy proposition at best, and often produce weird problems, problems caused by starving other devices, or just not working at all.
Another USB issue to keep in mind on the Pi4, is that the USB2.0 ports share a common root port - there is an integrated USB2.0 4-port hub in the VLI chip, so the total USB2.0 bandwidth across all 2.0 ports is 480mbit/s. USB3.0 hubs forward *both* USB3.0 and USB2.0 traffic, so the bandwidth limit applies even if you plug a USB2.0 device into a downstream USB3.0 hub. The PI's VLI chip can only handle 480Mbs total, and a USB2.0 camera can easily starve that, if it's using USB2.0, and even if its attached to a USB3 external powered hub. Something Astroberry and Stellarmate users should be aware of.
Power-wise, the RPi4 uses 575 mA at idle. Thus, there remain only 625mA for all other directly attached devices, but only when the PI is doing nothing at all. Typically, under normal loads, the Pi probably pulls more like 650-850 mA during normal use, leaving 400-500 mA for all directly attached devices. This creates a problem - The USB 2.0 specs call for the capability to use up to 500mA per connection, and 900mA for USB3.0. The Pi can't cover the potential load the spec places on it's (2) 3.0 and (2) 2.0 ports, which together would require 2800mA of power to attached devices to meet the basic USB spec.
Best practice - minimize the use of USB2.0 ports to the maximum extent possible, and move all devices requiring power to a powered USB3.1 hub.
Isn't the SV-305 a usb2.0 camera?